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area of room=5×4×3
=60m^2
cost of white washing=7.50×60
=450 Rs
=60m^2
cost of white washing=7.50×60
=450 Rs
247him:
it is incorrect, you have calculated volume not area
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Answer:
given,
height = 5m
length = 4m
breadth = 3m
surface area of 4 walls = 2 x ( 5x4 + 5x3) = 2 x (35) = 70m²
surface area of ceiling = 4x3 = 12m²
total surface area = 70 + 12 = 82m²
rate of white washing = Rs 7.50 per m²
cost of white washing 82m² = 82 x 7.50 = Rs. 615
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