# MAT115

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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 -

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 -

In the problem is the base "unknown"?

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