Need help for my exam "If a product is sold for 2500 euros, then the loss would be 8%. How much should the product be sold to reach 8% profit?"
There is sometimes lack of clarity when one deals with percentages: $8\%$ of what?
My interpretation is $8\%$ of the price the item cost us. So let $C$ be that cost. We have $$C-(0.08)C=(1-0.08)C=(0.92)C=2500.$$
To make an $8\%$ profit, we have to sell at price $P$, where $$P=C+(0.08)C=(1.08)C$$ Use the first equation to find an expression for $C$, and then use the second equation to find an expression for $P$. Finally, calculate.