-50.78% is the change from 256 to 126
Calculation steps:
[( 126 - 256 ) ÷ 256] x 100 = -50.78%
Formula
Percentage change = [(126 - 256) / 256] x 100
Subtract the new number by the original number
126 - 256 = -130
-130 ÷ 256 = -0.5078125
-0.5078125 x 100 = -50.78%