A dishonest dealer sells the goods at 6.25% loss on cost price but uses 12.5% less weight. What is his percentage profit or loss?

You can assume cost price as Rs. 100 for 100g

According to question, he sells the goods at a loss price of 6.25%, meaning his selling price is Rs. 6.25 less than cost price, making it 93.75.
Moreover, he uses a 12.5% less weight, meaning for every 100g, he is actually selling 87.5g.

Using this data, assuming he sells 100g.

Actual grams sold: 87.5g
Price of 87.5g = Rs. 87.5

Selling price of 100g = Rs. 93.75

So profit percentage for him is (93.75 - 87.5) / 87.5 *100 =7.143%

Assume price as 100, 6.25 percent loss means 1/16 in fractions so multiply 100 by 15/16 to reduce it by 1/16.
Now 12.5 percent less weight means 1/8 means he actually sells 7/8 and makes the rest as profit therefore 8/7 is the multiplier as he sells 7 and makes 1 profit so total 8 multiply these both to the hundred u get 15/14 which means 7.14 profit .hope this helps