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A cylindrical pillar is $100 cm$ in diameter and $2.5 m$ in height. What is the cost of painting curved surface of the pillar at the rate of $1250 per m 2$ ?

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Rs .9812.5

Rs .8 812.1

Rs .7 8.115

Rs .6 81.05

answer is A.

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Detailed Solution

Given- a cylindrical pillar is

100 cm

in diameter and

2.5 m

in height.

d = 100 cm = 1 m r = 0.5 m h = 2.5 m

C .S . A = 2 π r h = 2 × 227 × 0.5 × 2.5 = 557 = 7.85

Then, the cost of painting curved surface of the pillar will be,

= 7.85 × 1250 = R s .9812.5

Thus, the cost of painting the curved surface of the pillar is

Rs .9812.5

.
Hence, option 1 is the correct option.

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