20 off 500 = 480.
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The amount after the discount is 400.
500 x 1.2 = 600
8 times with 20 remaining 500 - 20 = 480 = 60 x 8
20 nickels = 1 dollar so 500 million nickels = 500 million / 20 = 25 million dollars.
20% of 500 = 20% * 500 = 0.2 * 500 = 100