RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Mensuration-II (Volumes and Surface Areas of a Cuboid and a Cube)

Subject: Maths - Class 8th

Q. No. 14 of Exercise 21.3

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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.


Length of room = 4.5 m

Breadth of wall = 3 m

Height of wall = 350 cm =


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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