G.E.D. Math 12d, Solving percentage word problems using mental math

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How to use mental math to solve percent word problems, quickly figure out a tip or commission amount. See the link to tax brackets for the U.S.A. (though this about to change :-/ )
2017-2018 Federal Income Tax Brackets:

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Mrs. Joann, that ticket totals $20.60 (not $30.60). 12.00+2.60+6.00=

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