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20 dollars is 20 percent of 100 dollars.
30% off of 20 dollars = 70% of 20 dollars = 20*70/100 = 14 dollars.
20% off of 324 dollars = (100-20)% of 324 dollars ie 80% of 324 dollars = 324*80/100 dollars = 259.20 dollars
20% off of 370 dollars = 80% of 370 dollars = 370*80/100 = 296 dollars
20% off 37 dollars = 80% of 37 dollars = 37*80/100 = 29.60 dollars.