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The increase from 50 to 90 is: 80%
+50%
180% of 50 = 180% * 50 = 1.8 * 50 = 90
50 - 90% = 50 x (1 - (90/100)) = 50 x 0.1 = $5 Therefore, 90 percent off 50 dollars is equal to 5 dollars.
40 cause 90-50 = 40