30.3% is the change from 99 to 129
Calculation steps:
[( 129 - 99 ) ÷ 99] x 100 = 30.3%
Formula
Percentage change = [(129 - 99) / 99] x 100
Subtract the new number by the original number
129 - 99 = 30
30 ÷ 99 = 0.30303030303030304
0.30303030303030304 x 100 = 30.3%