9. A room is 8 m long, 6 m broad and 5,5 m high. It has one door of dimensions 2.5 mm by 2 m and 2
windows each of dimensions 1.5 m by 1 m. Find the cost of whitewashing the walls at 33.20 per sq. m. .
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Step-by-step explanation:
area of four walls = 2h(l+b)
=2×5.5(8+6)
=11×14
=154 m²
area of door =2.5×2
=5m²
area of 2 windows =2×1.5×1
=3m²
area to be whitewashed= 154 - ( 5+3 )
=146 m²
cost= 33.2×146
=Rs. 4847.20
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