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50 cents is 25% of $2.00
50 - 90% = 50 x (1 - (90/100)) = 50 x 0.1 = $5 Therefore, 90 percent off 50 dollars is equal to 5 dollars.
50% of 52 dollars = 52*50/100 dollars = 26 dollars.
50% off 80 dollars = 40 dollars.
50% off of 400 dollars is 200 dollars