A circular signboard has a radius of 3.5 m. If painting costs ₹50 per m2 and 10% of the board is left unpainted, what is the total painting cost?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. ₹1,732.50
Area of board = πr2 = (22/7) × 3.5 × 3.5 = 38.5 m2
Painted area = 0.9 × 38.5 = 34.65 m2
Total painting cost = 34.65 × 50 = 1732.50