100% is the change from 211 to 422
Calculation steps:
[( 422 - 211 ) ÷ 211] x 100 = 100%
Formula
Percentage change = [(422 - 211) / 211] x 100
Subtract the new number by the original number
422 - 211 = 211
211 ÷ 211 = 1
1 x 100 = 100%
Example