-98.04% is the change from 255 to 5
Calculation steps:
[( 5 - 255 ) ÷ 255] x 100 = -98.04%
Formula
Percentage change = [(5 - 255) / 255] x 100
Subtract the new number by the original number
5 - 255 = -250
-250 ÷ 255 = -0.9803921568627451
-0.9803921568627451 x 100 = -98.04%