401.19% is the change from 84 to 421
Calculation steps:
[( 421 - 84 ) ÷ 84] x 100 = 401.19%
Formula
Percentage change = [(421 - 84) / 84] x 100
Subtract the new number by the original number
421 - 84 = 337
337 ÷ 84 = 4.011904761904762
4.011904761904762 x 100 = 401.19%