Hello!

I wanted to know if a person here take a loan for example of 0.1 BTC the worth 1000$ ( for example )

and people are giving him X money/BTC for his loan
when he will need to return the loan is he return th X amount of money that he take for a loan or X amount of BTC

I am asking because if for example I toke an loan of 0.1 BTC that worth 1000USD and I said i will repay next month and the next month 0.1 BTC worth 1500 USD
so how much i need to return still the 0.1 BTC or 1000 USD?

Thank for the help !