The central hall of a school is 80 m long and 8 m high . it has 10 doors each of size 3m × 1.5m and 10 windows each of size 1.5 m × 1 m . if the cost of white washing the walls of the hall at the rate of Rs 1.20 per meter square , find the breadth of the wall.
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breadth of central hall is 48m
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