The trick as pointed by kendash, is to create another Calculation Selector, but dont name the Button Header, let it empty.
Just follow almost exaclty how emre explained, but with two changes:
1- in Calculation Type: in “Rate or Amount:” use 10 instead of 5;
2- in Calculation Selector, Create another one (can be with exact same name), and in “Button Header:” you leave empty.
Screen Shots:
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