-47.66% is the change from 256 to 134
Calculation steps:
[( 134 - 256 ) ÷ 256] x 100 = -47.66%
Formula
Percentage change = [(134 - 256) / 256] x 100
Subtract the new number by the original number
134 - 256 = -122
-122 ÷ 256 = -0.4765625
-0.4765625 x 100 = -47.66%