Question

the walls and ceiling of a room are to be platered. the length, breadth and height of the of the room are 4.5 m, 3 m and 350 cm .find the cost of plastering at the rate of ₹8per metre2​

Answer 1

Step-by-step explanation:

area of four walls and ceiling=(4.5×3)+(3×3.5×2)+(4.5×3.5×2)

=66

cost=66×8

528

Answer 2

STEP BY STEP

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