Solve and choose the correct answer. The cost of whitewashing the four walls of a room of dimensions length = 7m , breadth = 6m and height = 5m at the rate of Rs 100 /m2 is: O . Rs. 13000
Rs. 15400
Rs. 21000

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Class 9

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>>Surface Area of Cubes and Cuboids

>>The length, breadth and height of a room

Question

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The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost white washing the walls of the room and ceiling at the rate of Rs. 7.50 per m

2

.

Medium

Solution

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Given:

L=5 m, B=4 m, H=3m

⇒Area to be white-washed = Area of cuboid − Area of base.

=2lh+2bh+2lb−lb

=2lh+2bh+lb

=[2×5×3+2×4×3+5×4]m

2

=74m

2

Cost of white washing per m

2

area = Rs.7.50

Cost of white washing 74m

2

area=74×7.50

= Rs.555

they are simplified

step-by-step explanation: