9.01% is the change from 111 to 121
Calculation steps:
[( 121 - 111 ) ÷ 111] x 100 = 9.01%
Formula
Percentage change = [(121 - 111) / 111] x 100
Subtract the new number by the original number
121 - 111 = 10
10 ÷ 111 = 0.09009009009009009
0.09009009009009009 x 100 = 9.01%