81.4% is the change from 129 to 234
Calculation steps:
[( 234 - 129 ) ÷ 129] x 100 = 81.4%
Formula
Percentage change = [(234 - 129) / 129] x 100
Subtract the new number by the original number
234 - 129 = 105
105 ÷ 129 = 0.813953488372093
0.813953488372093 x 100 = 81.4%