137.21% is the change from 129 to 306
Calculation steps:
[( 306 - 129 ) ÷ 129] x 100 = 137.21%
Formula
Percentage change = [(306 - 129) / 129] x 100
Subtract the new number by the original number
306 - 129 = 177
177 ÷ 129 = 1.372093023255814
1.372093023255814 x 100 = 137.21%