How to find fractional percentages - SAT Math

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Question

Bob and Jill go eat dinner at a fancy restaurant. Bob gets lobster and Jill gets crab legs. The lobster cost , and the crab legs cost . If they leave tip, how much is the combined bill?

Answer

To do this, we need to sum up each meal, and then convert the tip into a decimal.

$\text{Bill}=$60+$50+0.15($60+$50)$

$\text{Bill}=$110+0.15($110)$

$\text{Bill}=$110+$16.50$

$\text{Bill}=$126.50$

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