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A room 9 m long, 6 m broad and 3.6 m high has one door 1.4 m by 2 m and two windows, each 1.6 m by 75 cm. Find:
(i)The area of 4 walls, excluding doors and windows
(ii) the cost of white-washing the walls from inside at the rate of Rs. 22.50 per m²
(iii) the cost of painting it's ceiling at Rs. 25 per m²

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