-89.8% is the change from 255 to 26
Calculation steps:
[( 26 - 255 ) ÷ 255] x 100 = -89.8%
Formula
Percentage change = [(26 - 255) / 255] x 100
Subtract the new number by the original number
26 - 255 = -229
-229 ÷ 255 = -0.8980392156862745
-0.8980392156862745 x 100 = -89.8%