The Diameter of Roller 1.5 M Long is 84 Cm. If It Takes 100 Revolutions to Level a Playground, Find the Cost of Levelling this Ground at the Rate of 50 Paise per Square Metre. - Mathematics

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The diameter of roller 1.5 m long is 84 cm. If it takes 100 revolutions to level a playground, find the cost of levelling this ground at the rate of 50 paise per square metre. 

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Given that, 

Diameter of the roller=84cm=0.84m. 

Length of the roller=1.5m 

Radius of the roller =`D/2=0.84/2=0.42.` 

Area covered by the roller on one revolution = covered surface area of roller  

Curved surface of roller= `2pirh=2xx22/7xx0.42xx1.5`


Area of the playground=`"100xxArea covered by roller in one revolution"` 



Now , 

Cost of leveling `1 m^2=50P=50/100⇒Re=1/2rs` 

Cost of leveling `396m^2=1/2xx396=Rs.198` 

Hence, cost of leveling `396m^2 is   198`

Concept: Surface Area of Cylinder
  Is there an error in this question or solution?


RD Sharma Mathematics for Class 9
Chapter 19 Surface Areas and Volume of a Circular Cylinder
Exercise 19.1 | Q 10 | Page 8

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