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There is a cylinder platform of 2m radius and 50cm height. If the cost of white washing the curved surface of this platform at the rate of 12.5 per 100 sq.cm is___

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2460

3567

7850

2565

answer is C.

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Detailed Solution

Curved surface area of cylinder ( CSA ) = 2πrh
r = 2m = 200m
CSA = 2 × 3.14 × 200 × 50
= 1256cm × 50
= 62800cm2
Cost of white washing

\frac{12.5}{100}

× 62800 cm2
= Rs 7850
Hence the cost of white washing the curved surface of this platform is Rs 7850

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