If you will charge 200 for fixing it, this is permissible. But if you are going to make a profit of the part itself, this is not permissible.

I have a garage; man comes to get his car repaired. It requires parts which I have to buy and this requires me to spend time, effort, transportation etc. So I tell him that the parts will cost him 1000 Dirhams, and he agrees – but I know that the parts will cost only 800 Dirhams. What is the ruling on the extra money that I charged him?

Islamic economy | August 3, 2015 2:38 am
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I want to know if i understood the hadith right about not to sell something which u do not possess. I will make an example, i hope you understand and can give rule if this is permissible. I work in a company and they would sell me furniture for 300 dollars. I have not bought any. What i want to do is tell a friend “hey i want to sell u a piece of furniture for 600 dollars.” The friend agrees and is about to hand u the money but the problem is u havent owned the furniture so u will have to go buy it first and then sell. And since u dont want to go in risk to buy the furniture first and have nobody to buy it, you would tell your friend “give me 600 and i will hand it over to u tomorrow”. So u made a deal with a friend that ure gonna sell something to him but first he has to give u the money, so that u can buy it from that owner (since u dont own it) for 300 dollars then u keep the other half. Is this permissible?
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Regarding latest question: u cant sell something u dnt own. resellers- who buy from the company at factory rates and then sell it to customer by adding own profit.All the furniture resellers only order when the customer orders and pays atleast 50% of money.dey dnt own it (becoz its not even made yet) they use customers money to order frm company.u said its not permissible?