-76.47% is the change from 255 to 60
Calculation steps:
[( 60 - 255 ) ÷ 255] x 100 = -76.47%
Formula
Percentage change = [(60 - 255) / 255] x 100
Subtract the new number by the original number
60 - 255 = -195
-195 ÷ 255 = -0.7647058823529411
-0.7647058823529411 x 100 = -76.47%