Ramesh claims that he is selling onions at Rs. 36 per kg, which costs him Rs. 40 per kg, but he gives 800 grams instead of 1 kg. Find Ramesh's percentage gain or loss.

Solution (By Examveda Team)

$${\text{Loss}} = \frac{4}{{80}} \times 100 = 10\% $$

$$\eqalign{ & {\text{Profit}} = \frac{{200}}{{800}} \times 100 = 25\% \cr & {\text{Over all profit}} \cr & = 25 - 10 - \frac{{25 \times 10}}{{100}} \cr & = 12.5\% {\text{ Answer}} \cr} $$