7. 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 24 $cm$ and height 16 $cm$. Find the cost of the paper to make the joker’s cap, if the cost of $100 \ cm^2$ canvas is $₹$140.

$($Use $\sqrt{3} = 3.143)$

 

 

Cost of the paper to make the joker’s cap $=$ $₹$

 

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