How do you calculate taxable cost if total cost with tax is given?

I had to do this a couple of times, before I ignored the algebra and just went the easy way. C = P/1.06 Total Cost - Price = P Cost

• In store cost = C Tax Rate = T C + T = P and T = C * .06 (or

whatever your tax rate is) Substituting: C + (C * .06) = P 1C + .06C = P (Understood 1, base is the same, so you can add it together.) 1.06C = P C = P/1.06 Example, Total Cost - Price = $61.94, Tax Rate - T= .06, Find the original In Store Cost - C C = P/1.06 C = $61.94/1.06 C = $58.43 To Check, Original In Store Cost

• C $58.43 * Tax Rate .06 = $3.51 Tax Add Cost to Tax = $58.43 +

$3.51 = $61.94