Question

A bus stop is barricated from the remaining part of the road, by using 50 hollow cones made of recycled card-board. Each cone has a base diameter of 40 cm and height 1 m. If the outer side of each of the cones is to be painted and the cost of painting is Rs. 12 per m2 , what will be the cost of painting all these cones.

Answer 1

Radius of cone (r) = 40/2 = 20 m = 0.2 m

Thus, it will cost Rs. 38434 (Approx) in painting the so hollow cones.