75 percent of 400 dollars is 300 dollars.
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55% of 400 dollars = 400*55/100 = 220 dollars
30% off of 400 dollars = 70% of 400 dollars = 400*70/100 = 280 dollars
50% off of 400 dollars is 200 dollars
7.5% of 400 = 7.5% * 400 = 0.075 * 400 = 30
6750 dollars