-51.37% is the change from 255 to 124
Calculation steps:
[( 124 - 255 ) ÷ 255] x 100 = -51.37%
Formula
Percentage change = [(124 - 255) / 255] x 100
Subtract the new number by the original number
124 - 255 = -131
-131 ÷ 255 = -0.5137254901960784
-0.5137254901960784 x 100 = -51.37%