7. Five marks example problems III

The length, breadth and height of a hall are \(25 \ m\), \(15 \ m\) and \(5 \ m\) respectively. Find the cost of renovating its floor and four walls at the rate of \(₹ 80\) per \(m^2\).

 

The cost of renovating the floor \(=\) \(₹\)