11. Exercise Problems VIII

A bus stop is barricaded from the remaining part of the road, by using \(50\) hollow cones made of recycled cardboard. 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 \(m^2\) , what will be the cost of painting all these cones? (Use \(π = 3.14\) and take \(\sqrt{1.04} = 1.02\))

 

Cost of painting: