Set CAP on Tax Calculations in Business Rules

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I'm looking for an example of a calculation of taxes that has a yearly CAP amount. I need to set up a tax calculation that has the following components:

"Salary" * 6% (capped at 3,868 per year) + "Salary" * 4% (capped at 188 per year) +"Salary" * 2.3% (capped at 1,469 per year)

Can I use a sum function to have it stop once the cap is reached without creating other accounts to do the calculation?

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