A rectangular room is 3.5m long, 4m wide and 3 m high. Find the cost of white washing
it’s walls and the roof at ₹ 7.50 per m².
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Step-by-step explanation:
l=3.5m
b=4m
h=3m
surface area of walls=3.5*3*2+4*3*2
=14+24
=38m^2
cost=38*7.5
=rupee285
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