# 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

 [ A ]    4136 Rs. [ B ]    4316 Rs. [ C ]    4436 Rs. [ D ]    4536 Rs.
 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