$12.75
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15% off of 99.99 dollars = 85% of 99.99 dollars = 99.99*85/100 = 84.99(15) dollars.
$11.90 is $14 with 15% off. [ 100%-15% = 85%; 85% X $14 = $11.90. ]
15% off of 110 dollars = 85% left of 110 dollars = 110*0.85 = 93.50 dollars.
15% off of 90 dollars = 85% of 90 dollars = 90*85/100 = 76.50 dollars
15% off of 45 = 85% of 45 = 45*85/100 = 38.25