Is there a specific percentage limit on profit, such as buying an item for ten riyals and then selling it for twenty?

Question:
May Allah reward you. Honorable Shaykh, this questioner asks: Is there a specific limit on the percentage of profit, such as buying an item for ten riyals and then selling it for twenty, or more, or slightly less?

Answer:
This depends on the market. You sell according to the market price. Do not deceive the buyer. If he does not know the price, do not raise the price for him, or say, "I bought it for such-and-such," when you are lying to him, or say, "It will be worth such-and-such," when you are lying. This is *najsh* (bidding up the price). The Prophet (peace and blessings be upon him) said, "Do not engage in *najsh*." So, if the increase is prevailing in the market, there is nothing wrong with it. But if it is the result of lying, deception, trickery, and misleading, it is forbidden. Yes.