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40 percent of 50 = $20
70% of 50 is 35 and so 50-35 = 15 dollars
50 - 90% = 50 x (1 - (90/100)) = 50 x 0.1 = $5 Therefore, 90 percent off 50 dollars is equal to 5 dollars.
50% off 80 dollars = 40 dollars.
50% off of 400 dollars is 200 dollars