Evelyn's new smartphone cost $499, and she paid $42.42 in sales tax. What was the sales tax rate?

1. Divide the tax paid by the purchase price: 42.42 divided by 499. 2. This gives 0.085. 3. Move the decimal point two places to the right and add a percent sign: 8.5%. 4. So the sales tax rate is 8.5%, not 8.05%, which would come from moving the decimal point only one place. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 6 "Percents", section 6.3 Solve Sales Tax, Commission, and Discount Applications_