The four walls of a room with dimensions 12 m × 15 m × 20 m are to be white washed at the rate of ₹ 2/m2. Find the cost.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. ₹ 2,160.
Given:
The four walls of a room with dimensions 12 m × 15 m × 20 m
Cost of white washing = ₹ 2/m2
Formula used:
Area of four walls = 2(l + b) × h ---- (1)
Where, l = length, b = breadth and h = height
Calculations:
Using equation (1), we get
Area of four walls = 2(12 + 15) × 20
⇒ 2 × 27 × 20 = 1080
Required cost of white washing = 2 × 1080 = 2160