the length, breath and height of a room are 5m, 4m, 3m, respectively. find the cost of white washing the wall of the room and ceiling at the rate of Rs 8. 50 per m²
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Answer:
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.(74×8.50)=Rs.629
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1
we know this room is in the form of cuboid
so we have to find total surface area of cubooid-area of floor
= 2lb+2bh+2lh-bh
= 2bh+2lh+lb
=2×4×3+2×5×3+5×4
= 24+30+20
= 24+50
= 74 sq.m
cost of white washing = 8.50 × 74 = 629 Rs
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