50% off 80 dollars = 40 dollars.
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Discount: -$13.93 Total: $68.42
If you take 80% of 80 dollars away, you are left with 16 dollars.
24 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.