-79.61% is the change from 255 to 52
Calculation steps:
[( 52 - 255 ) ÷ 255] x 100 = -79.61%
Formula
Percentage change = [(52 - 255) / 255] x 100
Subtract the new number by the original number
52 - 255 = -203
-203 ÷ 255 = -0.796078431372549
-0.796078431372549 x 100 = -79.61%