30% of $280
= 30% * $280
= 0.30 * $280
= $84
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30% off of 400 dollars = 70% of 400 dollars = 400*70/100 = 280 dollars
30% of 280= 30% * 280= 0.3 * 280= 84
28 dollars. 280*.1=28
35% of 280 dollars = 280*35/100 = 98 So 35% off of 280 dollars = 280-98 = 182 dollars
$400 - 30% = 400 x (1 - (30/100)) = 400 x 0.7 = 280 dollars.