120% is the change from 100 to 220
Calculation steps:
[( 220 - 100 ) ÷ 100] x 100 = 120%
Formula
Percentage change = [(220 - 100) / 100] x 100
Subtract the new number by the original number
220 - 100 = 120
120 ÷ 100 = 1.2
1.2 x 100 = 120%
Example