Twenty one cylindrical pillars of the Parliament House are to be cleaned. If the diameter of each pillar is 0.50 m and height is 4 m, what will be the cost of cleaning them at the rate of Rs. 2.50 per square matre?
Number of pillars = 20
Diameter of pillar = 0.50 m
Radius of pillar =
Height of pillar = 4 m
Curved surface area of pillar =
Curved surface area of 20 pillars = 20 ×
∴ Cost of cleaning them at rate Rs.2.50 per m2 = Rs.
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