13. 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 the room at the rate of 12/square mitre
Answers
Answer:
13. 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 the room at the rate of 12/square mitre
Answer:
Total cost of Plastering is Rs. 528
Step-by-step explanation:
Given: Dimensions of Room, Length = 4.5 m , Breadth = 3 m &
Height = 350 cm. Cost of Plastering = Rs. 8 per m^2m
2
To find: Total cost of Plastering
Length, l = 4.5 m
Breadth, b = 3 m
Height, h = 350 cm = 3.5 m
Area of Plastering = Area of 4 walls + Area of ceiling
= Curved Surface Area of Cuboid + Area of rectangle
= 2 × h × ( l + b ) + l × b
= 2 × 3.5 × ( 4.5 + 3 ) + 4.5 × 3
= 7 × ( 7.5 ) + 13.5
= 52.5 + 13.5
= 66 m^2m
2
Total cost of Plastering = 66 × 8
= Rs. 528
Therefore, Total cost of Plastering is Rs. 528.
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