A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting the covered surface of the pillar at the rate ₹ 10 per sq m . ?
₹ 50
₹ 68
₹ 98
₹ 55
Correct Option: D
Curved surface area = 2πrh = 2 x (22/7) x 0.25 x 3.5 = 5.5 sq m ∴ Cost of painting 5.5 sq m = 10 x 5.5 = ₹ 55
