25% is the change from 136 to 170
Calculation steps:
[( 170 - 136 ) ÷ 136] x 100 = 25%
Formula
Percentage change = [(170 - 136) / 136] x 100
Subtract the new number by the original number
170 - 136 = 34
34 ÷ 136 = 0.25
0.25 x 100 = 25%
Example