Math

At a local music store CDs cost 11.99including tax is the number of CDs purchased proportional to the cost of the CDs

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  1. n + .08n = 11.99 tax = 8%
    1.08 n = 11.99

    11.10=n tax is .89

    lets say the is 6%

    11.31 = n tax is .68

    they are proportional. The proportion is the tax.

    try dividing the tax by the n in each case to see that the answer is the sales tax we used.

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