14. The walls and ceiling of a room are to be plastered. The length, breadth and height of at rate of Rs 8 per square metre.
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Step-by-step explanation:
Given, length of the room (l) = 4.5 m
Breadth of the room (b) = 3m
Height of the room (h) = 350 cm = 3.5 m
And the cost of plastering = Rs. 8perm
2
Therefore, the area of the walls = 2h(l+b)
= 2×3.5×(4.5+3) = 7×(7.5) = 52.2 m
2
Area of the ceiling = lb = 4.5×3 = 13.5m
2
Area of the room = 52.5+13.5 = 66m
2
Hence, the cost of plastering = 66×8 = Rs 528
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