125% is the change from 136 to 306
Calculation steps:
[( 306 - 136 ) ÷ 136] x 100 = 125%
Formula
Percentage change = [(306 - 136) / 136] x 100
Subtract the new number by the original number
306 - 136 = 170
170 ÷ 136 = 1.25
1.25 x 100 = 125%
Example