Identify the base in the following application: The sales tax rate is 8%. If you pay a tax of $2.50 on an item, what is the selling price. I don't know what the base is or how to solve the problem.

Answer 1

Check your text to find how base is defined in this situation.

To find the marked price before the tax, solve for x.

0.08x = 2.5
x = 2.5/0.08
x = 31.25

Answer 2

In the problem is the base "unknown"?