Assalamualaikum, I would like to ask what i should do with riba money that have been mixed with non riba money.
Let's say for example we do some business and sometimes the transactions we do contains riba. Let's say we made $10 in one transaction. A part of that $10 contains riba(around 3%-10%). The problem from that $10 we don't know how many % of it is riba(the 3% - 10% are random in every transaction). $0.3 of it could contain riba or maybe up to $1 riba or maybe ocassionally a bit bigger than 10% of that $10.
Easiest example in real life is in the conventional forex market where traders got charged or earn from rollover fees(0-??%) if they have overnight transaction. The fees are riba, but what about the money that we made from trading? is it also considered doing riba business?
What should we do if we are in this condition? How can we know how much riba money we should get rid of by giving it to charity? And are we allowed to continue this business even though a bit of it contains riba and even if all the riba money were given to charity?