The length breadth and height of a room are 5m, 4m and 3m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of rupees 7.50 per m².
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Total Surface Area to be white washed
=LTA+ Area of the base
=2(l+b)h+lb=2(5+4)×3+5×4m
2
=74m
2
Cost of white washing =Rs.(74×7.50)=Rs.555
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