80% of 600 dollars is:
600 x 0.80 = 480 dollars
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50% off 80 dollars = 40 dollars.
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 of 156 dollars = 80% of 156 dollars = 156/80/100 = 124.8 dollars