# Sales Tax equation

I got:

After a 6% sales tax, a shirt cost 15.37 USD. Find the original cost of the shirt before sales tax.

Exactly how do I approach this? Thanks

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If this is homework, tag it as homework. If it is, then you need to ask your teacher to help you out before you ask strangers to do it for you. If it is not homework, then where are you coming across these problems, and why are you trying to answer them? PS This is not "linear algebra". –  Arturo Magidin Oct 4 '10 at 1:47
Both of the questions you posted tonight look very much like hw off of the same assignment. This site is not meant to be an online homework solver. There are other resources available for that =P If you are not in this position please tell us what the motivation for these problems are, what you have tried thus far, and where you are getting stuck or what it is you feel that you are not understanding clearly. –  jericson Oct 4 '10 at 1:54

Let x equal the original cost of the shirt. Then x plus the sales tax (.06 of x) equals 15.37. Solve for x.

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US\\$15.37 is 106% of the original cost. So solve for the cost.

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15.37 = 1.06x