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50% of 52 dollars = 52*50/100 dollars = 26 dollars.
25% off of 50 dollars = 75% of 50 dollars = 50*75/100 = 37.50 dollars
50 dollars - 40% = 60% [left] of 50 dollars = 50*60/100 = 30 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.