A rectangular room is 6m long, 5m wide, and 3.5m high. It has two doors of size 1.1m by 2m and 3 windows of size 1.5 m by 1.4m .Find the cost of white washing the walls and the ceiling of the room at the rate of Rs.5.30 per square metre.
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coast=2 (l+b)h+l×b-2 (area of door)-3 (area of windows )×5.30
=6×5×3.5+5×6-2×1.1×2-3×1.5×1.4
=106+30-4.4-6.3
=136-10.7
=125.30
=6×5×3.5+5×6-2×1.1×2-3×1.5×1.4
=106+30-4.4-6.3
=136-10.7
=125.30
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