12. Find the area of the four walls of a room 10 m long, 8 m wide and 4 m high. If the room has
2 doors 2 mx 1.6 m and four windows each of size 1 mx 1.6 m, find the cost of white washing the
walls at 12 per sq. metre. Also, find the cost of plastering its ceiling at 16 per sq. metre
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