A cylindrical pillar 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 Rs. 12.50 per m2.
Diameter=D=50 cm
Radius of cylinder =r=D2=502 cm=25 cm=0.25 m
Height of cylinder, h=3.5 m
Curved Surface Area of cylinder =2πrh
=2π(0.25×3.5) m2=5.5 m2
Cost of painting per meter square =Rs. 12.50
Total cost of painting 5.5 m2=Rs. 12.50×5.5=Rs. 68.75