Subtracting 20 percent from 154 gives 154 x (1 - (20/100)) = 123.2
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154 is 100*154/20 = 770% of 20.
20%
20% off of 770 = 616= 20% discount applied to 770= 770 - (20% * 770)= 770 - (0.20 * 770)= 770 - 154= 616
30% off of 154.00 = 70% of 154 = 154*70/100 = 107.80
154%