What is the ruling on selling a commodity to one customer at one price and to another customer at a higher price?

The questioner : Please. Peace be upon you. And upon you be peace. I am on the phone. Fine. How are you, Shaykh? Yes. I have a question. Please. What is the ruling on selling a commodity to one customer at one price and to another customer at a different price, knowing that for the one who does not know the price of the commodity, we increase the price by double or several times? Is this increase its value in the market, or is it extra? Is this increase its value in the market? Yes, sometimes, meaning some of them and some of them do not.

The Shaykh : If it is more than what is in the market, it is not permissible.

The questioner : Okay, and what is the ruling on the price of the commodity, for example, it costs me twenty and I sell it for a hundred?

The Shaykh : If this is the market price, there is nothing wrong with it. There is nothing wrong, yes.

The questioner : May Allah reward you with good, peace be upon you. Peace be upon you and mercy

The Shaykh : Allah.