-29.02% is the change from 255 to 181
Calculation steps:
[( 181 - 255 ) ÷ 255] x 100 = -29.02%
Formula
Percentage change = [(181 - 255) / 255] x 100
Subtract the new number by the original number
181 - 255 = -74
-74 ÷ 255 = -0.2901960784313726
-0.2901960784313726 x 100 = -29.02%