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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