20900% is the change from 2 to 420
Calculation steps:
[( 420 - 2 ) ÷ 2] x 100 = 20900%
Formula
Percentage change = [(420 - 2) / 2] x 100
Subtract the new number by the original number
420 - 2 = 418
418 ÷ 2 = 209
209 x 100 = 20900%
Example