-47.27% is the change from 256 to 135
Calculation steps:
[( 135 - 256 ) ÷ 256] x 100 = -47.27%
Formula
Percentage change = [(135 - 256) / 256] x 100
Subtract the new number by the original number
135 - 256 = -121
-121 ÷ 256 = -0.47265625
-0.47265625 x 100 = -47.27%