A backpack costs $18 and has a 7 percent tax. How much will Sheila have to pay for the backpack after tax?

First find the tax: 7% of $18 is 0.07 × $18 = $1.26. Add the tax to the original price: $18 + $1.26 = $19.26. Sheila will pay $19.26, which is choice C.

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