Final answer:
The independent variable is the purchase price and the dependent variable is the sales tax.
Step-by-step explanation:
The independent variable in this scenario would be the purchase price, as it is the variable that can be changed or controlled. The dependent variable would be the sales tax, as it depends on the value of the purchase price. In this case, the sales tax is 5% of the purchase price, so as the purchase price changes, the sales tax will also change accordingly.
Learn more about Independent and Dependent Variables