-72.16% is the change from 255 to 71
Calculation steps:
[( 71 - 255 ) ÷ 255] x 100 = -72.16%
Formula
Percentage change = [(71 - 255) / 255] x 100
Subtract the new number by the original number
71 - 255 = -184
-184 ÷ 255 = -0.7215686274509804
-0.7215686274509804 x 100 = -72.16%