Question

the length , breadth and height of a room are 5m,4m, and 3m respectively . find the cost of White washing the inner of the room and the ceiling at a rate of ₹50 per square metre
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Answer 1

surface area=2(lb+bh+hl)
=2(5×4+4×3+3×5)
=2(20+12+15)
=2(47)
=94m^2
cost=94×50
=₹4700
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