The amount after the discount is $3.50
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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.
72 dollars !
10% off of 115 dollars = 90% of 115 dollars = 115*90/100 = 103.50 dollars
15% off of 90 dollars = 85% of 90 dollars = 90*85/100 = 76.50 dollars
10% off is the same as 90% left. 90% of 65 dollars = 65*90/100 = 58.50 dollars.