30% of $400
= 30% * 400
= 0.3 * 400
= $120
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75 percent of 400 dollars is 300 dollars.
55% of 400 dollars = 400*55/100 = 220 dollars
$10 50c
30% off of 400 dollars = 70% of 400 dollars = 400*70/100 = 280 dollars
24 dollars :)