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Question

Find the cost of plastering the inner surface of a well at Rs 9.50 per m2, if it is 21m deep and diameter of its top is 6m.


Solution

Diameter of the top of a cylindrical well =6m
Radius(r)= 62=3m
and depth (h)=21cm
Curved surface area =2πrh
=2×227×3×21m2=396m2
Rate of plastering = Rs.9.50perm2
Total cost of plastering =Rs9.50×396
=Rs. 3.762

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