10 is 20% of 50
therefore
20% off 50 = 40
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40 percent of 50 = $20
$10 ($40).
40% of 50 = 20
$30 off, which makes the item $20.
The easier way to take 20% off something is to multiply that somethi ng by 0.8. Example: take 20% off 50 = 50 * 0.8 = 40