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30% of 400 = 30% * 400 = 0.3 * 400 = 120
30% of $400 = 30% * 400 = 0.3 * 400 = $120
-370
$400 - 30% = 400 x (1 - (30/100)) = 400 x 0.7 = 280 dollars.
30% off of 400 dollars = 70% of 400 dollars = 400*70/100 = 280 dollars