The height of a cone is 16 cm and radius of its base is 20 cm.If the rate of painting is Rs. 14rs/cm2 , then what will be the total cost in painting the curved surface of cone from outside?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Rs. 44880
Curved surface area of cone = πrl (where l = √202 - 162 = 12
Curved surface area of cone = 22 × 20 × 12/7
Curved surface area of cone = 5280/7
If the rate of painting is Rs. 14rs/cm2
Total cost = 5280 × 14/7 = 10560 Rs.