Question 100281
(Original price)+ (original price)(.20)=$4,680  [solve for the "orginal price"]
x+(x)(.20)=4680
x+.20x=4680
1.20x=4680
1.20x/1.20=4680/1.20
x=$3,900

.
Checking:
$3900 + (3900)(.20)=$4,680
$4,680=$4,680 [checks out]