Adding percent when a button is clicked



I have a button that I want to add that when click it adds 3% to the total. The total field is calculated via three other numerical boxes.  I wrote a simple formcalc to run on click of the button but it does nothing. Total * 1.03 is what I used. 

The total field is calculated via Foundation+GraniteCost+addon

I just assumed I could put Total * 1.03 and it would add the percent.  What other information do you need?

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