Math (Algebra/Pre-Algebra)

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A book has been discounted 20% and now sells for $15. How much did it cost before the discount?

  • Math (Algebra/Pre-Algebra) -

    After we took off 20%, doesn't the $15 represent 80% of what it used to cost?
    so .8x=15
    x = 15/.8
    = 18.75

    test the answer by taking 20% of that, and subtracting it.
    Do we get $15 ?

  • Math (Algebra/Pre-Algebra) -

    That is one of the choices so my guess is that that is correct. Thank you! =]

  • Math (Algebra/Pre-Algebra) -

    8=1/4x-6

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