A tent is in the shape of a cylinder, surmounted by a conical top. If the height and diameter of the cylindrical part are \(3.5 \ m\) and \(6 \ m\), and slant height of the top is \(4.2 \ m\), find the area of canvas used for making the tent. Also, find the cost of canvas of the tent at the rate of \(₹ 500\) per \(m^2\).
Ans: \(₹\)