Two way fields

Is it possible to create a pair of two way fields. In quotes we would like to have two fields. One of them a user can input the percent margin (as a whole number) the other the user can input the price in $s we would like to make. I want both of these fields to calculate themselves if one of them is filled in. 

For example if I fill in the percent margin the price needed to be charged should calculate. If I put in the Price I'd like to charge the margin should calculate. I have the formulas written out for both these fields I'd just like to make editable somehow while still retaining the formula in Sugar.

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