50% is a half of 27 dollars, which is $13.50 (thirteen dollars and fifty cents).
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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
25% off of 50 dollars = 75% of 50 dollars = 50*75/100 = 37.50 dollars
65 dollars