-52.16% is the change from 255 to 122
Calculation steps:
[( 122 - 255 ) ÷ 255] x 100 = -52.16%
Formula
Percentage change = [(122 - 255) / 255] x 100
Subtract the new number by the original number
122 - 255 = -133
-133 ÷ 255 = -0.5215686274509804
-0.5215686274509804 x 100 = -52.16%