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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