15% off of 90 dollars = 85% of 90 dollars
= 90*85/100 = 76.50 dollars
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600 x .15 = 90$ now subtract 90$ from 600$ and you get 510$
50 - 90% = 50 x (1 - (90/100)) = 50 x 0.1 = $5 Therefore, 90 percent off 50 dollars is equal to 5 dollars.
72 dollars !
90 cents
10% off of 115 dollars = 90% of 115 dollars = 115*90/100 = 103.50 dollars