20900% is the change from 1 to 210
Calculation steps:
[( 210 - 1 ) ÷ 1] x 100 = 20900%
Formula
Percentage change = [(210 - 1) / 1] x 100
Subtract the new number by the original number
210 - 1 = 209
209 ÷ 1 = 209
209 x 100 = 20900%
Example