Question

The walls and ceiling of a room are to be plastered. The length, breadth and height of the room are 4.5 m , 3m, and 350 cm respectively. Find the cost of plastering at the rate of Rs.8perm2.
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Answer 1

Answer:

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

Step-by-step explanation:

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