-46.88% is the change from 256 to 136
Calculation steps:
[( 136 - 256 ) ÷ 256] x 100 = -46.88%
Formula
Percentage change = [(136 - 256) / 256] x 100
Subtract the new number by the original number
136 - 256 = -120
-120 ÷ 256 = -0.46875
-0.46875 x 100 = -46.88%