The length, breadth, and height of a room are 7 m, 5 m, and 3m, respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of Rs. 16 per m2
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Rs. 1,712.
Given that
The length, breadth, and height of a room are 7 m, 5 m and 3m, respectively
The ceiling at the rate of Rs. 16 per m2
Area of walls of the room = 2(l + b) × h
where, l = length of room, b = breadth of room, h = height of room
Calculation
Area of walls of the room = 2 (7 + 5) × 3 = 72 cm2
Area of the roof = 7 × 5 = 35 cm2
Hence, the required cost of whitewashing of walls = (72 + 35) × 16 = Rs. 1712