100% is the change from 212 to 424
Calculation steps:
[( 424 - 212 ) ÷ 212] x 100 = 100%
Formula
Percentage change = [(424 - 212) / 212] x 100
Subtract the new number by the original number
424 - 212 = 212
212 ÷ 212 = 1
1 x 100 = 100%
Example