Question

The dimensions of a room are 10m × 7m × 5m . There are 2 doors and 3 windows in the room.The dimensions of the doors are 1m × 3m. One window is of size 2m × 1.5m and the other two windows are of size 1m × 1.5m. The cost of painting the walls at ₹ 3 per m² is

• A. ₹ 578.50
• B. ₹ 474
• C. ₹ 684
• D. ₹ 894

Answer 1

The Correct Option is B

Area of 4 walls =\( 2(l+b)h =2(10+7)\) \(\times\) 5
= 170 sq m
Area of 2 doors and 3 windows = 2(1\(\times\)3)+(2\(\times\)1.5)+2(1\(\times\)1.5)
= 12 sq m
Area to be planted = \(170 -12 = 158 sq m\)
Cost of painting = Rs. 158 \(\times\) 3 = Rs. 474.
So the correct option is (B)