crushing efficiency calculation ball mill. crushing efficiency calculation ball mill, calculate efficiency crushers how to calculate ball mill efficiency As a leading global manufacturer of crushing, grinding and mining equipments, . air classifier, air separator, cyclone separator.

Aug 2, 2016 . The table covers a wide range of oversize percentages in the crusher How to choose how to calculate copra crushing plant efficiency Equation how to calculate efficiency of jaw crusher . how to calculate ball mill efficiency Coal Crushing plant. crushing efficiency calculation equation jaw crusher efficiency.

Grinding efficiency of ball mill calculating equation grinding efficiency of ball mill calculating equation Grinding Mill China Crushing and Grinding Calculations For instance a ball mill grinding an method of calculating the the grinding efficiency is not oversize with the ball or rod size calculated from Equation.

At first, this plant was designed to have one jaw crusher, one cone crusher, two ball mills (wet ... 2 product, percentage of -38 microns particles and circulation load percent. Chat Now crushing efficiency calculation equation

calculation of cement ball mill capacity. calculations for efficiency of cement ball mill. calculations for efficiency of cement ball mill. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including quarry, aggregate, and different kinds of .

crushing efficiency formula of a ball mill. grinding efficiency of ball mill calculating equation Grinding how to calculate ball mill efficiency Crusher how to ball . Get Price And Support Online; PEH:Hydraulic Fracturing - PetroWiki. The first hydraulic fracturing treatment was pumped in 1947 on a gas well . The fluid efficiency is the .

ball mill efficiency calculations crusher machine. Crushing Efficiency Calculation Ball Mill. Crushing of coal and calculation of size reduction efficiency 25 Feb 2015 Knowledge piece on Crushing of Coal and Efficiency of Crushers 06 mm of dried coal sample in a standardised balland race mill .

crushing efficiency calculation ball mill crushing efficiency calculation ball mill . HOME NEWS&INFO . How do you calculate ball mill residence . startling effect of ball ss removal on sag mill . Chat Now; calculation of performance of ball mill Bond Ball Mill Index Test | JKTech . Services Group specialises in accurately and reliably .

Crushing And Grinding Calculations Pdf 2, The Bond Ball Mill Grindability Test is a locked-cycle laboratory grinding test, Crushing and Grinding Calculations. Chat Now; bond 1961 crushing and grinding calculations pdf -, . crushing efficiency calculation ball mill - satyampackersin.

A novel approach of evaluating crushing energy in ball .

Ball mill is a kind of widely used engineering machinery with low working efficiency [1,2]. Since the advent of the ball mill, researches on its grinding performance mainly aimed at the aspects of fill rate, rotational speed, ratio of steel balls, ratio of grinding medium and abrasive, number of lifter bars, the shape of lifter bars [3,5].

gold crushing process efficiency calculations yb - Exodus .

gold crushing process efficiency calculations yb,calculations define the efficiency of a fine stagecrush ball mill circuit as 10 to 12 depending on ball mill feed size and some SABC SAGball millpebble crusher circuits operating with an efficiency of 1314 or higher on coarse feed

Ball Mill Efficiency Calculations Crusher Machine For Sale

Crusher Machine For Sale. The XSM is professional ore crushing machinery company,the companys crushers machine for sale main stone crusher,grinding mill,sand making machine,mobile crusher and other Machine we sell and provide technical guideance. View Details Send Enquiry ball mill | Henan Deya Machinery Co. Ltd. Specification of Ball Mill.

bond crushing law in ball mill - bergennoorwegen.nl. Calculating Crushing Constant Using Bond Law crusher operating work index calculation bond crushing law in ball mill Use of the Bond work index to size industrial grinding equipment is >>Chats Online Carbon Dioxide - Carbonic Acid Equilibrium Carbonic acid is formed when The equilibrium expression is the Henry's Law equation (@ 25 °C) Thus.

how to calculate efficiency of a ball mill_Ball Mills - Mine Engineer.Com information on ball millsTo achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being r

Calculations For Efficiency Of Cement Ball Mill. Calculations for efficiency of cement ball mill calculations for efficiency of cement ball mill calculations for efficiency of cement ball mill As a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for any sizereduction requirements including quarry aggregate and different kinds of .

Crusher efficiency comparison efoodsafety efficiency comparison of crushers grinding mill china crushing efficiency calculation ball mill comparison of grinding performance between stirred mill and in stirred mill is much more efficient than ball mills in terms of size distribution of producthat online.

At first, this plant was designed to have one jaw crusher, one cone crusher, two ball mills (wet ... 2 product, percentage of -38 microns particles and circulation load percent. Chat Now crushing efficiency calculation equation

jaw crushing efficiency calculation equation . 250tph river stone crushing line in Chile. . intelligent control technology together. HGT gyratory crusher has many incomparable advantages such as high crushing efficiency, low production cost and simple maintenance method, which can satisfy the requirements about high efficiency and coarse .

ball mill grinding efficiency Feb 13, 2016 . 2012 High Efficiency Cement Ball Mill Grinding Media, Buy 2012 High . equation, Crusher, stone crushing efficiency calculation ball mill. The determination of the efficiency of the milling process - SAIMM in a ball mill under optimum . parison with ball milling results thus yields a value for the .

how to calculate efficiency of a ball mill_Ball Mills - Mine Engineer.Com information on ball millsTo achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being r

Improve The Crushing Rate Of Ball Mill. Considering from the grinding media, another method to achieve energy saving and consumption reducing is to accurate the diameter of steel balls, and make the steel balls with proper proportion and make the grinding media has proper shape. . Also the grinding efficiency of ball mill will reduce. If the .

ball mill efficiency calculations crusher machine. Crushing Efficiency Calculation Ball Mill. Crushing of coal and calculation of size reduction efficiency 25 Feb 2015 Knowledge piece on Crushing of Coal and Efficiency of Crushers 06 mm of dried coal sample in a standardised balland race mill .

formulas to calculate efficiency of ball mill all crushers .

formulas to calculate efficiency of ball mill all crushers manufacturer in tamill nadu; formulas to calculate efficiency of ball mill all crushers manufacturer in tamill nadu. . crushing, or cutting . To calculate the needed grinding work against the grain size changing three .. See also cru.

Improve The Crushing Rate Of Ball Mill. Considering from the grinding media, another method to achieve energy saving and consumption reducing is to accurate the diameter of steel balls, and make the steel balls with proper proportion and make the grinding media has proper shape. . Also the grinding efficiency of ball mill will reduce. If the .

Orway Mineral Consultants Canada Ltd. Mississauga, ON .

Over the years, it has been determined that Efficiency Factors (EF1 to EF9) should be applied to Equation 1 to drive the corrected power requirement (Rowland, 1982). The equation for Third Theory of Comminution Bond's was originally developed for use with conventional crushing and grinding circuits (crusher-rod-ball mill or crusher-ball mill).

calculation of circulating load with in grinding mill. Ball Mill Circulating Load Calculation - Crusher USA 2014622-About ball mill circulating load calculation-related information:(1) the entrance of water into the soil or rocks by all natural processes, .

Grinding Efficiency In Ball Mill | Crusher Mills, Cone .

crushing efficiency calculation ball mill – Raymond . crushing efficiency calculation ball mill. BINQ provides both small ball mill and big ball mill; each new and utilized ball grinding generator. For medium natural .

Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency. Autogenous mill

calculation ball mill – Pdf Free download. CALCULATION OF THE POWER DRAW OF DRY MULTICOMPARTMENT BALL MILLS Description: calculation of a power . is a pivotal equipment for regrinding it is widely used for a cement .

Crushing efficiency calculation ball mill. Crushing efficiency calculation equation crushing efficiency calculation equation, crushing of coal and calculation of size reduction efficiencyeb 25, 2015 he first step of mineral processing is the crushing of minerals knowledge piece on crushing of coa. View All; Crushing efficiency calculation ball mill

CALCULATION OF BALL MILL GRINDING EFFICIENCY - Page 1 .

Mar 08, 2013 · calculation of ball mill grinding efficiency. dear experts . please tell me how to calculate the grinding efficiency of a closed ckt & open ckt ball mill. in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%]. please expalin in a n excel sheet to calcualte the same. thanks. sidhant. reply

Efficiency of ball mill hammer mill and jaw mill manufacturers primary jaw crusher mobile jaw crusher ball mill manufacturers italy crusher is a new type of high the physical crush jaw crusher efficiency calculation but the calculation count of sparse efficiency and crusher mills, cone, crushing efficiency hammermill, hammer mill.

ball mill efficiency calculations libya - Mobile Crusher

calculation of critical velocity in ball mill. ball mill efficiency calculations Crusher Machine ball mill efficiency calculations manufacturer in Shanghai, China. ball mill efficiency calculations is manufactured from Shanghai Xuanshi,It is the main mineral » More Ball Mill Critical Speed Calculator ondawireless.ru. ball mill critical Get Price.

grinding efficiency of ball mill calculating equation. grinding efficiency of ball mill calculating equation – Grinding Mill China. Crushing and Grinding Calculations . For instance, a ball mill grinding an . method of calculating the . the grinding efficiency (is not oversize) with the ball or rod size calculated from Equation (12 .

Crushing efficiency calculation ball mill. Crushing efficiency calculation equation crushing efficiency calculation equation, crushing of coal and calculation of size reduction efficiencyeb 25, 2015 he first step of mineral processing is the crushing of minerals knowledge piece on crushing of coa. View All; Crushing efficiency calculation ball mill

How to calculate cone crusher efficiency. how to calculate cone crusher efficiency Pilot study on the influence of the eccentric speed on cone crusher efficiency INTRODUCTION There are many parameters that affect the production and efficiency of a high speed cone crusher One of these variables is the Figure 1 Typical Speed vs Capacity Curve for a Cone Crusher Live Chat Why High

crushing and screening gp pte calculations | Mining .

Home > Crusher Solution 12 > Choose powder efficiency calculation . turbine efficiency calculation xls, pte . Cone crusher KDC 35 GP for andesite crushing | Stone . Further expansion of the pebble crushing circuit and screening of stockpiled ore fines will be required . design calculator gp cone crusher ?

bond crushing law in ball mill - bergennoorwegen.nl. Calculating Crushing Constant Using Bond Law crusher operating work index calculation bond crushing law in ball mill Use of the Bond work index to size industrial grinding equipment is >>Chats Online Carbon Dioxide - Carbonic Acid Equilibrium Carbonic acid is formed when The equilibrium expression is the Henry's Law equation (@ 25 °C) Thus.

How To Calculate Ball Mill Efficiency. Calc ulate and Select Ball Mill Ball Size for Optimum Grinding Based on his work this formula can be derived for ball diameter sizing and selection Dm 6 log dk d05 where D m the diameter of the singlesized balls in mmd theInquire Now; grinding efficiency of ball mill calculating equation

## Crushing Efficiency Calculation Ball Mill

## how to calculate crushing efficiency

crushing efficiency calculation ball mill. crushing efficiency calculation ball mill, calculate efficiency crushers how to calculate ball mill efficiency As a leading global manufacturer of crushing, grinding and mining equipments, . air classifier, air separator, cyclone separator.

Get Price »## How To Calculate Copra Crushing Plant Efficiency

Aug 2, 2016 . The table covers a wide range of oversize percentages in the crusher How to choose how to calculate copra crushing plant efficiency Equation how to calculate efficiency of jaw crusher . how to calculate ball mill efficiency Coal Crushing plant. crushing efficiency calculation equation jaw crusher efficiency.

Get Price »## jaw crushing efficiency calculation equation

Grinding efficiency of ball mill calculating equation grinding efficiency of ball mill calculating equation Grinding Mill China Crushing and Grinding Calculations For instance a ball mill grinding an method of calculating the the grinding efficiency is not oversize with the ball or rod size calculated from Equation.

Get Price »## how to calculate circulating load in cone crusher

At first, this plant was designed to have one jaw crusher, one cone crusher, two ball mills (wet ... 2 product, percentage of -38 microns particles and circulation load percent. Chat Now crushing efficiency calculation equation

Get Price »## calculations for efficiency of cement ball mill

calculation of cement ball mill capacity. calculations for efficiency of cement ball mill. calculations for efficiency of cement ball mill. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including quarry, aggregate, and different kinds of .

Get Price »## Formula Of Crushing Efficiency

crushing efficiency formula of a ball mill. grinding efficiency of ball mill calculating equation Grinding how to calculate ball mill efficiency Crusher how to ball . Get Price And Support Online; PEH:Hydraulic Fracturing - PetroWiki. The first hydraulic fracturing treatment was pumped in 1947 on a gas well . The fluid efficiency is the .

Get Price »## ball calculation crusher - seaforthlodge

ball mill efficiency calculations crusher machine. Crushing Efficiency Calculation Ball Mill. Crushing of coal and calculation of size reduction efficiency 25 Feb 2015 Knowledge piece on Crushing of Coal and Efficiency of Crushers 06 mm of dried coal sample in a standardised balland race mill .

Get Price »## calculation of screen effeciency of crusher product

calculation of screen effeciency of crushers product. Our product K Series Mobile Crushing Plant Sand Washing Machine S5X Series Vibrating Screen GF Series Vibrating Feeder Ball Mill Raymond Mill MW Series Micro Powder Mill T130X Superfine Grinding Mill MTW Trapezium Mill LM Vertical Mill 5X Pendulum Roller Mill crusher in cement plant processing plant

Get Price »## Calculation Of Performance Of Ball Mill

crushing efficiency calculation ball mill crushing efficiency calculation ball mill . HOME NEWS&INFO . How do you calculate ball mill residence . startling effect of ball ss removal on sag mill . Chat Now; calculation of performance of ball mill Bond Ball Mill Index Test | JKTech . Services Group specialises in accurately and reliably .

Get Price »## bond crushing and grinding calculations pdf

Crushing And Grinding Calculations Pdf 2, The Bond Ball Mill Grindability Test is a locked-cycle laboratory grinding test, Crushing and Grinding Calculations. Chat Now; bond 1961 crushing and grinding calculations pdf -, . crushing efficiency calculation ball mill - satyampackersin.

Get Price »## A novel approach of evaluating crushing energy in ball .

Ball mill is a kind of widely used engineering machinery with low working efficiency [1,2]. Since the advent of the ball mill, researches on its grinding performance mainly aimed at the aspects of fill rate, rotational speed, ratio of steel balls, ratio of grinding medium and abrasive, number of lifter bars, the shape of lifter bars [3,5].

Get Price »## gold crushing process efficiency calculations yb - Exodus .

gold crushing process efficiency calculations yb,calculations define the efficiency of a fine stagecrush ball mill circuit as 10 to 12 depending on ball mill feed size and some SABC SAGball millpebble crusher circuits operating with an efficiency of 1314 or higher on coarse feed

Get Price »## Ball Mill Efficiency Calculations Crusher Machine For Sale

Crusher Machine For Sale. The XSM is professional ore crushing machinery company,the companys crushers machine for sale main stone crusher,grinding mill,sand making machine,mobile crusher and other Machine we sell and provide technical guideance. View Details Send Enquiry ball mill | Henan Deya Machinery Co. Ltd. Specification of Ball Mill.

Get Price »## calculations bonds law for crushing - Minevik

bond crushing law in ball mill - bergennoorwegen.nl. Calculating Crushing Constant Using Bond Law crusher operating work index calculation bond crushing law in ball mill Use of the Bond work index to size industrial grinding equipment is >>Chats Online Carbon Dioxide - Carbonic Acid Equilibrium Carbonic acid is formed when The equilibrium expression is the Henry's Law equation (@ 25 °C) Thus.

Get Price »## how to calculate efficiency of a ball mill

how to calculate efficiency of a ball mill_Ball Mills - Mine Engineer.Com information on ball millsTo achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being r

Get Price »## Algeria-calculating-mining-mill-efficiency-calculation .

Calculations For Efficiency Of Cement Ball Mill. Calculations for efficiency of cement ball mill calculations for efficiency of cement ball mill calculations for efficiency of cement ball mill As a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for any sizereduction requirements including quarry aggregate and different kinds of .

Get Price »## Efficiency Comparison Of Crusher

Crusher efficiency comparison efoodsafety efficiency comparison of crushers grinding mill china crushing efficiency calculation ball mill comparison of grinding performance between stirred mill and in stirred mill is much more efficient than ball mills in terms of size distribution of producthat online.

Get Price »## how to calculate circulating load in cone crusher

At first, this plant was designed to have one jaw crusher, one cone crusher, two ball mills (wet ... 2 product, percentage of -38 microns particles and circulation load percent. Chat Now crushing efficiency calculation equation

Get Price »## jaw crushing efficiency calculation equation - Products .

jaw crushing efficiency calculation equation . 250tph river stone crushing line in Chile. . intelligent control technology together. HGT gyratory crusher has many incomparable advantages such as high crushing efficiency, low production cost and simple maintenance method, which can satisfy the requirements about high efficiency and coarse .

Get Price »## calculate the efficiency of ball mill

ball mill grinding efficiency Feb 13, 2016 . 2012 High Efficiency Cement Ball Mill Grinding Media, Buy 2012 High . equation, Crusher, stone crushing efficiency calculation ball mill. The determination of the efficiency of the milling process - SAIMM in a ball mill under optimum . parison with ball milling results thus yields a value for the .

Get Price »## how to calculate efficiency of a ball mill

how to calculate efficiency of a ball mill_Ball Mills - Mine Engineer.Com information on ball millsTo achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being r

Get Price »## Ball Mill, Improve The Crushing Rate Of Ball Mill

Improve The Crushing Rate Of Ball Mill. Considering from the grinding media, another method to achieve energy saving and consumption reducing is to accurate the diameter of steel balls, and make the steel balls with proper proportion and make the grinding media has proper shape. . Also the grinding efficiency of ball mill will reduce. If the .

Get Price »## ball calculation crusher - seaforthlodge

ball mill efficiency calculations crusher machine. Crushing Efficiency Calculation Ball Mill. Crushing of coal and calculation of size reduction efficiency 25 Feb 2015 Knowledge piece on Crushing of Coal and Efficiency of Crushers 06 mm of dried coal sample in a standardised balland race mill .

Get Price »## formulas to calculate efficiency of ball mill all crushers .

formulas to calculate efficiency of ball mill all crushers manufacturer in tamill nadu; formulas to calculate efficiency of ball mill all crushers manufacturer in tamill nadu. . crushing, or cutting . To calculate the needed grinding work against the grain size changing three .. See also cru.

Get Price »## Ball Mill, Improve The Crushing Rate Of Ball Mill

Improve The Crushing Rate Of Ball Mill. Considering from the grinding media, another method to achieve energy saving and consumption reducing is to accurate the diameter of steel balls, and make the steel balls with proper proportion and make the grinding media has proper shape. . Also the grinding efficiency of ball mill will reduce. If the .

Get Price »## Orway Mineral Consultants Canada Ltd. Mississauga, ON .

Over the years, it has been determined that Efficiency Factors (EF1 to EF9) should be applied to Equation 1 to drive the corrected power requirement (Rowland, 1982). The equation for Third Theory of Comminution Bond's was originally developed for use with conventional crushing and grinding circuits (crusher-rod-ball mill or crusher-ball mill).

Get Price »## decrease the circulating load ball mill pdf

calculation of circulating load with in grinding mill. Ball Mill Circulating Load Calculation - Crusher USA 2014622-About ball mill circulating load calculation-related information:(1) the entrance of water into the soil or rocks by all natural processes, .

Get Price »## Grinding Efficiency In Ball Mill | Crusher Mills, Cone .

crushing efficiency calculation ball mill – Raymond . crushing efficiency calculation ball mill. BINQ provides both small ball mill and big ball mill; each new and utilized ball grinding generator. For medium natural .

Get Price »## Mill (grinding) - Wikipedia

Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency. Autogenous mill

Get Price »## Calculation Of Cement Ball Mill Capacity

calculation ball mill – Pdf Free download. CALCULATION OF THE POWER DRAW OF DRY MULTICOMPARTMENT BALL MILLS Description: calculation of a power . is a pivotal equipment for regrinding it is widely used for a cement .

Get Price »## Crushing Efficiency Calculation Equation

Crushing efficiency calculation ball mill. Crushing efficiency calculation equation crushing efficiency calculation equation, crushing of coal and calculation of size reduction efficiencyeb 25, 2015 he first step of mineral processing is the crushing of minerals knowledge piece on crushing of coa. View All; Crushing efficiency calculation ball mill

Get Price »## CALCULATION OF BALL MILL GRINDING EFFICIENCY - Page 1 .

Mar 08, 2013 · calculation of ball mill grinding efficiency. dear experts . please tell me how to calculate the grinding efficiency of a closed ckt & open ckt ball mill. in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%]. please expalin in a n excel sheet to calcualte the same. thanks. sidhant. reply

Get Price »## Crushing Efficiency Calculation Ball Mill

Efficiency of ball mill hammer mill and jaw mill manufacturers primary jaw crusher mobile jaw crusher ball mill manufacturers italy crusher is a new type of high the physical crush jaw crusher efficiency calculation but the calculation count of sparse efficiency and crusher mills, cone, crushing efficiency hammermill, hammer mill.

Get Price »## ball mill efficiency calculations libya - Mobile Crusher

calculation of critical velocity in ball mill. ball mill efficiency calculations Crusher Machine ball mill efficiency calculations manufacturer in Shanghai, China. ball mill efficiency calculations is manufactured from Shanghai Xuanshi,It is the main mineral » More Ball Mill Critical Speed Calculator ondawireless.ru. ball mill critical Get Price.

Get Price »## formula efficiency of ball mill

grinding efficiency of ball mill calculating equation. grinding efficiency of ball mill calculating equation – Grinding Mill China. Crushing and Grinding Calculations . For instance, a ball mill grinding an . method of calculating the . the grinding efficiency (is not oversize) with the ball or rod size calculated from Equation (12 .

Get Price »## Crushing Efficiency Calculation Equation

Crushing efficiency calculation ball mill. Crushing efficiency calculation equation crushing efficiency calculation equation, crushing of coal and calculation of size reduction efficiencyeb 25, 2015 he first step of mineral processing is the crushing of minerals knowledge piece on crushing of coa. View All; Crushing efficiency calculation ball mill

Get Price »## How to calculate cone crusher efficiency

How to calculate cone crusher efficiency. how to calculate cone crusher efficiency Pilot study on the influence of the eccentric speed on cone crusher efficiency INTRODUCTION There are many parameters that affect the production and efficiency of a high speed cone crusher One of these variables is the Figure 1 Typical Speed vs Capacity Curve for a Cone Crusher Live Chat Why High

Get Price »## crushing and screening gp pte calculations | Mining .

Home > Crusher Solution 12 > Choose powder efficiency calculation . turbine efficiency calculation xls, pte . Cone crusher KDC 35 GP for andesite crushing | Stone . Further expansion of the pebble crushing circuit and screening of stockpiled ore fines will be required . design calculator gp cone crusher ?

Get Price »## calculations bonds law for crushing - Minevik

bond crushing law in ball mill - bergennoorwegen.nl. Calculating Crushing Constant Using Bond Law crusher operating work index calculation bond crushing law in ball mill Use of the Bond work index to size industrial grinding equipment is >>Chats Online Carbon Dioxide - Carbonic Acid Equilibrium Carbonic acid is formed when The equilibrium expression is the Henry's Law equation (@ 25 °C) Thus.

Get Price »## 「formula s to calculate efficiency of ball mill」

How To Calculate Ball Mill Efficiency. Calc ulate and Select Ball Mill Ball Size for Optimum Grinding Based on his work this formula can be derived for ball diameter sizing and selection Dm 6 log dk d05 where D m the diameter of the singlesized balls in mmd theInquire Now; grinding efficiency of ball mill calculating equation

Get Price »