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/PreAlgebra)  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/PreAlgebra)  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/PreAlgebra)  Anonymous, Thursday, September 1, 2011 at 9:43am
8=1/4x6
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