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A cylindrical pillar is 50cm in diameter and 3.5 cm in height. Find the cost of painting the curved surface of the pillar at the rate of Rs.10 per sq m.

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Rs. 0.55

Rs. 2

Rs. 10

Rs. 5

answer is A.

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Detailed Solution

Given a cylinder, d = 50 cm, h = 3.5 cm and

π = 227

.
We know that, curved surface area of cylinder

= 2 π r h

π d h

CSA = 227 × 50 × 3.5 ⇒ 22 × 50 × 0.5 ⇒ 22 × 25 ⇒ 550 c m 2

.
We know that, 1m² = 10000 cm².
So,

CSA = 55010000 m 2

.
The cost of painting the pillar is,

Cost = 55010000 × 100 Cost = 55100 Cost = Rs . 0 .55

Therefore, the correct option is 1.

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