Question 381809
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Hi,         
Let x represent the original price
Note:  20% off is the same as paying 80% of the original value
 .80x = $12,590
    x = $12,590/.80
    x = $15,737.50

CHECKING our Answer
$15,737.50 - .20*$15,737.50 = $15,737.50 - $3147.50 =  $12,590