-11.76% is the change from 255 to 225
Calculation steps:
[( 225 - 255 ) ÷ 255] x 100 = -11.76%
Formula
Percentage change = [(225 - 255) / 255] x 100
Subtract the new number by the original number
225 - 255 = -30
-30 ÷ 255 = -0.11764705882352941
-0.11764705882352941 x 100 = -11.76%