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)×h−areaofdoors−areaofwindow=2(6.2+3.8)×3.2−2×2×1.2−2×1.2×1.5=64−4.8−3.6=55.6m2