According to Exchange A, I can withdraw 1 BTC as 90 fiat. Or I can send them 1 fiat in return for 0.01 BTC. How do I calculate percentage fees for one way conversion?


The formula to calculate that is:

100% x (1-√(BTC x fiat))

where BTC and fiat are the two values highlighted in gray above.

Using the values given in the quesiton, it is 5.1%.

(Assuming that the conversion fees in both ways are calculated as a percentage, with the multiplier)

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