Posted by **barb** on Thursday, July 22, 2010 at 11:31am.

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.

- MAT115 -
**Ms. Sue**, Thursday, July 22, 2010 at 11:38am
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

- MAT115 -
**barb**, Thursday, July 22, 2010 at 12:37pm
In the problem is the base "unknown"?

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