A cylindrical pillars is 50 cm in diameter and 3.5 m in height. Find the cost of painting the curved surface of the pillar at the rate of 12.50 per m2.
Given,
Diameter of cylindrical pillar = 50 cm
So, radius of pillar = 
Height of pillar = 3.5 m
So, curved surface area of pillar = 2πrh =
Cost of painting 1 m2 area = 12.50 rs.
∴ cost of painting 55 m2 = 
3