Estimate the cost of painting the inner wall of a well, if the depth of the well is 21 ft and the diameter is 5ft . the cost of painting 3.3 sq ft is 20 rupees
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cost of painting = Rs(20 * C.S.A of well/2.5)
= Rs (20 * 2 * 22/7 * 4 * 14 * 1/2.5)
= Rs 2816
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