109% is the change from 100 to 209
Calculation steps:
[( 209 - 100 ) ÷ 100] x 100 = 109%
Formula
Percentage change = [(209 - 100) / 100] x 100
Subtract the new number by the original number
209 - 100 = 109
109 ÷ 100 = 1.09
1.09 x 100 = 109%
Example