-27.45% is the change from 255 to 185
Calculation steps:
[( 185 - 255 ) ÷ 255] x 100 = -27.45%
Formula
Percentage change = [(185 - 255) / 255] x 100
Subtract the new number by the original number
185 - 255 = -70
-70 ÷ 255 = -0.27450980392156865
-0.27450980392156865 x 100 = -27.45%