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प्रश्न
The walls and ceiling of a room are to be plastered. The length, breadth and height of the room are 4.5 m, 3 m, and 350 cm respectively. Find the cost of plastering at the rate of Rs 8 per m2.
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उत्तर
Given,
Length of the room `(l)` = 4.5 m
Breadth of the room `(b)` = 3 m
Height of the room `(h)` = 350 cm = 3.5 m
And the cost of plastering = Rs 8 per m2
∴ Area of the walls = `2h(l + b)`
= 2 × 3.5 × (4.5 + 3)
= 7 × (7.5)
= 52.5 m2
Area of the ceiling = `lb`
= 4.5 × 3
= 13.5 m2
Area of the room = 52.5 + 13.5
= 66 m2
Hence, the cost of plastering = 66 × 8 = Rs 528
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