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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 ?

Correct answer: B. Rs.57

  • A. Rs.60
  • B. Rs.57
  • C. Rs.55
  • D. Rs.52

Explanation

The area of the four walls is 2h(l + b) = 2 x 3 m x (15 m + 4 m) = 114 m2. At 50 paise per m2, or Rs.0.50 per m2, the cost is 114 m2 x Rs.0.50/m2 = Rs.57. Students may choose Rs.60, option a, by rounding the wall area or ignoring the breadth term.

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