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Anonymous
The amount after the discount is $3.20
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4 dollars off, leaving 16 dollars.
4 dollars
$16 $20 = 100% $2 = 10% $4 = 20% $20 - $4 = $16
20% off $4.50 = $4.50 - (0.20 x $4.50) = $3.60
4 dollars 5 times 4 equals 20