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A television costs 270.25 dollars including 15% tax. How much of the cost is tax?

  • maths -

    270.25(1 - 1/1.15) = 35.25

  • maths -

    But where does the (1-1) from (1-1/1.15) come from?

  • maths -

    1.15p = 270.25
    p = 270.25/1.15 = 235

    270.25-235 = 35.25
    so,
    35.25 = 270.25 - 270.25/1.15 = 270.25(1-1/1.5)

  • maths -

    But where does the 1.15 p come from

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