29% is the change from 100 to 129
Calculation steps:
[( 129 - 100 ) ÷ 100] x 100 = 29%
Formula
Percentage change = [(129 - 100) / 100] x 100
Subtract the new number by the original number
129 - 100 = 29
29 ÷ 100 = 0.29
0.29 x 100 = 29%
Example