The diameter and height of a cylindrical tower are 10 m and 21m, respectively. What will be the cost of painting its curved surface, at the rate of Rs.8 per m2?(Use = )
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. Rs.5,280.
Diameter = 10 m ad height = 21 m
Cost of painting = Rs.8/m2
The exterior curved surface area of Chimney = 2πrh = πdh
⇒ 22/7 × 10 × 21 = 660 m2
Cost of painting = 660 × 8 = Rs.5280