Posted by jojo on Tuesday, September 9, 2008 at 8:40pm.
assume x is the undiscounted price
100% of x - 10% of x = 72
1.00x - 0.10x = 72
x (1.00-0.10) = 72
x (0.90) = 72
x = 72 / 0.90
x = 80
Regular price is $80.00
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