If the loss is 13% and the cost price is C the loss is given by -(S-C)/C where S is the selling price. The leading minus means loss instead of gain. (C-S)/C=1-1475/C=0.13, 0.87=1475/C so C=1475/0.87=Rs1695.40.
Now. S=1615, loss/gain=(S-C)/C=(1615-1695.40)/1695.40=-0.0474=loss of 4.74%.