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The inner diameter of a circular well is . It is deep. Find
I. Its inner curved surface area
II. The cost of plastering this curved surface at the rate of

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inner curved surface area is

and cost of plastering is

inner curved surface area is

and cost of plastering is

inner curved surface area is

and cost of plastering is

inner curved surface area is

and cost of plastering is

answer is D.

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Detailed Solution

In this question the inner diameter of a circular well is

and well is

deep. The cost of plastering this curved surface area is

Step 1: First, we calculate the curved surface area of the given well. As we know that the well is circular in shape, it is easy for us to calculate it using the formula-

….(1) .

Step 2: Here the rate of plastering the well is

for per square meter. The cost of plastering for plastering entire inside wall of well is nothing but

We have the inner curved surface area is

and cost of plastering is

So, option 4 is correct.

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The inner diameter of a circular well is . It is deep. FindI. Its inner curved surface areaII. The cost of plastering this curved surface at the rate of

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The inner diameter of a circular well is . It is deep. Find
I. Its inner curved surface area
II. The cost of plastering this curved surface at the rate of