Livia’s bill for lunch came to 8 dollars 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 tip is 15% of the $8 bill before tax: 0.15 × $8 = $1.20. The sales tax is 7% of $8: 0.07 × $8 = $0.56. Add the bill, tip, and tax: $8 + $1.20 + $0.56 = $9.76, so the total cost is 9.76 dollars.

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