A tax or tip is an additional percentage of a stated base amount, usually the pre-tax price or bill; the learner calculates the additional amount by multiplying by the percent expressed as a decimal or fraction, then adds it to the base to find the total. For simple problems, any tax and tip are each calculated from the original amount rather than compounded, supporting proportional reasoning with money; changing rates, reverse calculations, and compound or multi-stage taxes are beyond this scope.
A tax or tip is found by multiplying the original amount by the rate written as a decimal.
A restaurant bill is 24.0015%$ tip.
Change the percent to a decimal:
Find the tip by multiplying the bill by the decimal:
Add the tip to the original bill:
The total bill, including the tip, is 27.60$.
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