$59.5
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It is: 85-25.5 = 59.5
$12.75
15% off of 99.99 dollars = 85% of 99.99 dollars = 99.99*85/100 = 84.99(15) dollars.
15% off of 110 dollars = 85% left of 110 dollars = 110*0.85 = 93.50 dollars.
$11.90 is $14 with 15% off. [ 100%-15% = 85%; 85% X $14 = $11.90. ]