-48.83% is the change from 256 to 131
Calculation steps:
[( 131 - 256 ) ÷ 256] x 100 = -48.83%
Formula
Percentage change = [(131 - 256) / 256] x 100
Subtract the new number by the original number
131 - 256 = -125
-125 ÷ 256 = -0.48828125
-0.48828125 x 100 = -48.83%