The walls and ceiling of a room are to be plastered. The length, breadth nad 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 square metre.
Given,
Length of room = 4.5 m
Breadth of wall = 3 m
Height of wall = 350 cm = 
So,
Area of ceiling + area of walls = 
= 
=
Cost of plastering 1 m2 area = Rs.8
∴ Cost of plastering 66 m2 area = 66 ×8 =Rs.528
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