A well is 23.5 m deep and its diameter is 14m. Find the cost of plastering the inner curved surface at Rs. 4 per square metre

Answer : Option A

Explanation :

Total cost of plastering the inner curved surface area = 2 $\times$ $22 \over 7$ $\times$ $14 \over 2$ $\times$ 23.5 $\times$ 4 = Rs. 4136

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