-75% is the change from 136 to 34
Calculation steps:
[( 34 - 136 ) ÷ 136] x 100 = -75%
Formula
Percentage change = [(34 - 136) / 136] x 100
Subtract the new number by the original number
34 - 136 = -102
-102 ÷ 136 = -0.75
-0.75 x 100 = -75%
Example