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OpenStudy (anonymous):
Purvi and her friends tipped their waiter a total of 8 dollars for dinners that cost 9 dollars, 8 dollars, 11 dollars and 12 dollars each. Use a percent proportion to solve for the percent tip they left the waiter. Show your work.
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OpenStudy (anonymous):
9 + 8 + 11 +12 = 40 8/40 = 0.2 = 20% tip
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