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Question

The dimensions of a room are 9m×8m×6.5m. It has one door of dimensions 2 m×1.5m and two windows each of dimensions 1.5m×1m. Find the cost of whitewashing the walls at Rs6.40 per m2​.



A

 Rs. 2297.6

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B

 Rs. 2207.2

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C

 Rs. 2107.2

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D

 Rs. 2007.2

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Solution

The correct option is A

 Rs. 2297.6


Total Surface Area = 2(lb+bh+hl) = 2(72 + 52 + 58.5) = 365m2

Area that is to be white washed = 365 - (2× 1.5) - 2(1.5 ×1) = 359 m2

Cost of White Washing = 359 × 6.4 = Rs.2297.6


Mathematics

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