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Question

A room is 6.2m long, 3.8m wide and 3.2 m high. It has 2 doors each 2m×1.2m and 2 windows each 1.2m×1.5m. Find the cost of white-washing its walls at the rate of Rs.10 per square metre.

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Solution

Area of walls to be white-washed =2(l+b)×hareaofdoorsareaofwindow=2(6.2+3.8)×3.22×2×1.22×1.2×1.5=644.83.6=55.6m2
Cost of white wash =Rs(10×55.6)=Rs556

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