-51.56% is the change from 256 to 124
Calculation steps:
[( 124 - 256 ) ÷ 256] x 100 = -51.56%
Formula
Percentage change = [(124 - 256) / 256] x 100
Subtract the new number by the original number
124 - 256 = -132
-132 ÷ 256 = -0.515625
-0.515625 x 100 = -51.56%