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The dimensions of a room are l = 8m, b = 5m and h = 4m. Find the cost of distempering its four walls at the rate of 40/m^2.

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The dimensions of a room are l = 8m, b = 5m and h = 4m. Find the cost of distempering its four walls at the rate of 40/m2.

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L.S.A of cuboid = 2h (l + b) 

= 2 × 4 (8 + 5) = 8 (13) 

L.S.A = 104 m2 

The cost of distempering 1 m2 = Rs 40 

The cost of distempering 104m2 = 104 × 40 = Rs. 4160.

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