A room is 8m long, 6m broad and 5.5m high. It has one door of dimensions 2.5m by 2m and 2 windows each of dimensions 1.5m by 1m. Find the cost of white-washing the walls at Rs.32 per sq.m.
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Answer:
lateral surface area of room=2h(l+b)
=(11×14)m^2
=154m^2
area of door=2.5m×2m=5m^2
area of window=1.5m×1m=1.5m^2
area of wall to be whitewashed=(154-5+1.5)m^2
=147.5m^2
cost of whitewashing=147.5×₹3.20=₹472
hope this will help you
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