D. A square room is 4 m long and 3 m high. Find the cost of colouring all the
four walls at Rs 2 per sq. m. ?
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Answer:
Area of 1 wall :- 4m * 3m = 12m.
Area of 4 walls :- 12 * 4 = 48m.
Cost = 48 * 2 = 96m^2
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