The internal length of a room is two times its breadth and three-times its height. The total cost of painting its four walls at the rate of Rs. 25/m2 is Rs. 3600. What is the cost of laying a carpet on its floor at the rate of Rs. 90.50/m2?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 6516
Let the height of the room = h
according to question length = 3h and breadth = (3h/2)
Area of walls = (3600 / 25) = 144 m2
then, 2(length + breadth) × height = 144
⇒ 2(3h + 1.5h) × h = 144
⇒ 9h2 = 144
⇒ h = 4
cost of laying carpet = length × breadth × 90.5 = 3 × 4 × (3/2) × 4 × 90.5 = 6516