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• All Rates will be expressed in terms of multiplication.
• you will never do division on rates to translate currency
• so if you have 5.00 us and 
• you wanted to convert to CAD 
• you would never take the CAD to usd rate and invert 
• you would just find the usd to cad rate
• when you save a rate its reciprocal pair will be saved
• usd to CAD 1.28 will save the reciprocal rate .7785 will be save
• you will need to setup both currency pairs if you want convert bi directional currency transactions

When you create a  currency rate the inversion of the rate is added if the reciprocal pair exists.  So you can not have different rates for the same currency pair in the opposite direction.

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