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Question

The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find the cost of plastering this curved surface at the rate of Rs. 40 per m2.

A
Rs. 4000
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B
Rs. 4400
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C
Rs. 4500
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D
Rs. 4800
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Solution

The correct option is C Rs. 4400
Given diameter of well is 3.5 m and depth is 10 m and cost of plastering is Rs. 40 per sq m.
Then radius of well =3.52=1.75 m
And height of well =10 m
Then curved surface area of well = 2πrh=2×227×1.75×10
= 2×22×0.25×10=110m2
Then cost of plastering curved surface area = 110×40= Rs. 4400.

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