the length, breadth and height of a room are 5m 4m and 3m respectively.find the cost of white washing the Wall of the room and the ceiling at the rate of ₹7.50 per metre square
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l=5m
b=4m
h=3m
lsa+l*b=2*(l+b)*h+l*b
=2*(5+4)*3+5*4
=2*9*3+20
=54+20
=74
cost of white washing 1m=rs 7.5
cost of 74m=7.5*74=rs555
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