The Diameter of 125 cm long roller is 84 cm. If it takes 500 complete revolutions to level a playground, find the cost of levelling at 75 paise per square metre.

Since roller is in the form of cylinder. So,

Diametre of roller = 84 cm

So, radius of roller (r) = 84/2 = 42 cm

And, Length of roller = height of cylinder (h) = 125 cm

Now,