The triangular side walls of a flyover have been used for advertisements. The sides of the walls are \(a=200 m\), \(b=160 m\) and \(c=120 m\) (see Fig.). The advertisements yield an earning of \(Rs.2000\) per \(m^2\) per year. A company hired one of its walls for \(3\) months. How much rent did it pay?
Total rent \(=Rs.\)