9.09% is the change from 99 to 108
Calculation steps:
[( 108 - 99 ) ÷ 99] x 100 = 9.09%
Formula
Percentage change = [(108 - 99) / 99] x 100
Subtract the new number by the original number
108 - 99 = 9
9 ÷ 99 = 0.09090909090909091
0.09090909090909091 x 100 = 9.09%