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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Solution

Given that height h = 1.5 m
Diameter = 84 cm = 0.84 m
Radius = $\frac{0.84}{2} = 0.42 m$

Now, we have to find the area of the ground.

= 396 m²

Cost of leveling for 1 m²= 0.50

Cost of leveling for 396 m²=

Cost of leveling for 396 m²= Rs.198

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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.

Given that height h = 1.5 m Diameter = 84 cm = 0.84 m Radius = 0.842=0.42 m Now, we have to find the area of the ground. = 396 m2 Cost of leveling for 1 m2 = 0.50 Cost of leveling for 396 m2 = ​ Cost of leveling for 396 m2 = Rs.198

Given that height h = 1.5 m
Diameter = 84 cm = 0.84 m
Radius = $\frac{0.84}{2} = 0.42 m$

Now, we have to find the area of the ground.

= 396 m²

Cost of leveling for 1 m²= 0.50

Cost of leveling for 396 m²=

Cost of leveling for 396 m²= Rs.198