"20 percent off" means "80 percent still on".
80% of $2,000 = 0.8 x $2,000 = $1,600.00
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600
$4.50
$84
70% off of 110 dollars = 30% of 110 dollars = 110*30/100 = 33 dollars.
40% off of 54 dollars = 60% of 54 dollars = 54*60/100 = 32.40 dollars