The 15 percent-off $123 or 15 percent discount for a item in which the original price is $123 is: $18.45
Using this formula
Amount = Original Price x Discount
Let plug in the formula
Amount= 123 x 15 / 100
Amount = 1845 / 100
Amount = $18.45
Inconclusion the 15 percent-off $123 is $18.45.
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