$21.00
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30 percent of 70 dollars will be approximately $21 US dollars.
30 % of 70 dollars = (30 / 100) * 70 = 21 dollars
30-21=9 dollars
"30 percent off" means "70 percent on" .70% = 0.70.7 x $130 = $91
70% off of 110 dollars = 30% of 110 dollars = 110*30/100 = 33 dollars.