A person sold an article at a loss of 4%. Had he sold it at a gain of 1%, he would have received RS 42.5 more. To gain 18%, what must be his selling price?

Rs 1003

If we take base(CP) as 100

In ratio, the given conditions can be written as - 

  SP1  :  CP  :  SP2

   96   : 100 :  101

The difference between SP1 and SP2 : 5R = 42.5(given)         

                                                          R = 8.5

Thus, CP = 100 x 8.5 = Rs 850  

SP at 18% gain = 850 x $\frac{118}{100}$ = Rs 1003