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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.
$18,000.
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
100% = 450 1% = 450/100 20% = (450/100) x 20 = 9000/100 = $90