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84% of 20 is 16.8
420 - 84 = 336
16.80 as a percentage of 20 = 16.80/20*100 = 84 %
84 percent of 100 is 84.
84 is 20% of 420. If you take 84 off of 420, you get 336. You could also look at it in another way, if you regard 20% as 0.2, then 420 - 0.2 is 419.8.