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I haven’t looked at one of these in months and wanted to see if I could still do it without referencing any notes. It was still as easy it was then b/c of a system I developed to remember how to do this:
1. If you hold the base currency (ie. the USD in USD:EUR) use the bid.
Otherwise use the ask
2. Always multiply by the bid and divide by the ask
That’s it! use that info and work the problem one way, if that doesn’t work go the other way.

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