Posted by **Samantha** on Thursday, June 4, 2009 at 8:48pm.

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

- Math (Algebra/Pre-Algebra) -
**Reiny**, Thursday, June 4, 2009 at 8:54pm
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) -
**Samantha**, Thursday, June 4, 2009 at 9:06pm
That is one of the choices so my guess is that that is correct. Thank you! =]

- Math (Algebra/Pre-Algebra) -
**Anonymous**, Thursday, September 1, 2011 at 9:43am
8=1/4x-6

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