I believe it is market-based, but what is the approximate ratio (e.g. 5:1, 2:1, etc)?
closed as too localized by spartacus, Fluttershy, Wipqozn, Frank, FAE Aug 29 '12 at 21:27
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You're right that it is market based, and there is no answer that will always hold true; however, you can always check to see exactly what the ratio is by pressing the "o" key to bring up the currency exchange window. You can also see past trends in the currency exchange rate.