-32.16% is the change from 255 to 173
Calculation steps:
[( 173 - 255 ) ÷ 255] x 100 = -32.16%
Formula
Percentage change = [(173 - 255) / 255] x 100
Subtract the new number by the original number
173 - 255 = -82
-82 ÷ 255 = -0.3215686274509804
-0.3215686274509804 x 100 = -32.16%