A room is 15m long, 4m broad and 3m height. Find the cost of white washing its four walls at 50p per m2 ?

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A room is 15m long, 4m broad and 3m height. Find the cost of white washing its four walls at 50p per m2 ?

A. Rs.60
B. Rs.57
C. Rs.55
D. Rs.52
Explanation:
2 *3(15 + 4) = 114
114 * 1/2 = Rs.57