Aditya sells two wrist watches from his personal collection for ₹12,600 each. On the first watch, he gains 26% and, on the second, he loses 10%. Find the overall gain or loss percentage.

Gain of 5%

Gain on first = 26% = \(\frac{63}{50}\)

Loss on second = 10% = \(\frac{9}{10}\)

               CP               SP

First =     50                63   

Second = 10               9

As the selling price is same for both the watches =

               CP               SP

First =     50                63 

Second = (10               9  ) × 7 

               CP               SP

First =     50                63 

Second = 70                63

           ————————————

             120              126  = 6(Profit)

Profit % = \(\frac{6 × 100}{120}\) = 5%