18. Evaluate the cost of the paper to make the joker's cap

A joker’s cap is in the form of a right circular cone of base diameter 40 \(cm\) and height 21 \(cm\). Find the cost of the paper to make the joker’s cap if the cost of \(100 \ cm^2\) canvas is \(₹\)150.

\((\)Use \(\sqrt{3} = 3.14)\)

 

 

Cost of the paper to make the joker’s cap \(=\) \(₹\)2732275027172709

 

[Note: Round off your cost to the whole number]