So lets say I put in $100 dollars. I buy while its at a low of $10,400. The price goes up to $10,400 and I sell. Whata my profit?
I really don't get what your statement but in terms of calculating your profit on investment what you need to do is to subtract your principal from the income you made from your investment. If you want to know the percentage increase then you divide your profit by the total income you made and multiply it by 100.
For example; you bought a coin at $100 and sold it at $300. Your profit would be $300-$100=$200
The percentage of profit will be (200/300)×100%