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1. The problem statement, all variables and given/known data

A child is surprised that she must pay $1.40 for a toy marked $1.25 because of sales tax. What is the effective tax rate on this purchase?

2. Relevant equations

3. The attempt at a solution

I know that the difference between the two is .15. I could just guess and check, but is there a formula?

Thank you very much

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# Homework Help: Sales tax formula

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