22.22% is the change from 99 to 121
Calculation steps:
[( 121 - 99 ) ÷ 99] x 100 = 22.22%
Formula
Percentage change = [(121 - 99) / 99] x 100
Subtract the new number by the original number
121 - 99 = 22
22 ÷ 99 = 0.2222222222222222
0.2222222222222222 x 100 = 22.22%