a room is 40m long 30m board and 10m high find the cost of whitewashing it's 4wall and cielling at Rs 20 per sq m
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Area of 4four =2(l+b) *h
=2*70*10=1400m²
Whitewashing cost=20*1400=₹28000
=2*70*10=1400m²
Whitewashing cost=20*1400=₹28000
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