A composite wall consists of a rectangle 12 m by 9 m with a triangular window of base 4 m and height 3 m cut out. If the wall needs to be painted at ₹120 per m2, find the painting cost after deducting the window area.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. ₹12,240.
Wall area = 12 × 9 = 108 m2
Triangle window area = (1/2) × 4 × 3 = 6 m2
Paintable area = 108 – 6 = 102 m2
Cost = 102 × 120 = 12240