-97.65% is the change from 255 to 6
Calculation steps:
[( 6 - 255 ) ÷ 255] x 100 = -97.65%
Formula
Percentage change = [(6 - 255) / 255] x 100
Subtract the new number by the original number
6 - 255 = -249
-249 ÷ 255 = -0.9764705882352941
-0.9764705882352941 x 100 = -97.65%