18 dollars.
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9000 dollars
100% = 450 1% = 450/100 20% = (450/100) x 20 = 9000/100 = $90
4 dollars off, leaving 16 dollars.
12 dollars off of 60 dollars.which is just 48 dollars. so 20 percent off of 60 dollars is 48 dollars.
30% off of 20 dollars = 70% of 20 dollars = 20*70/100 = 14 dollars.