Livia’s bill for lunch came to $8 before tax and tip. The restaurant included a 7 percent sales tax, and she left a 15 percent tip, which she calculated on the bill before the sales tax was added. What was the total cost of Livia’s lunch?

The 7% sales tax is 0.07 × $8 = $0.56, and the 15% tip is 0.15 × $8 = $1.20 because Livia calculated it before tax. Add both amounts to the $8 bill: $8 + $0.56 + $1.20 = $9.76, so the total cost is $9.76.

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