$7.20
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$36 x .20 ------ $7.20
$180 x 0.20 = $36$180 - $36 = $144
25 percent off of 36 dollars would be 9 dollars off.
20 dollars is 20 percent of 100 dollars.
40 percent of $36 dollars equals $14.40, so 40 percent off $36 leaves $21.60 remaining.