-24.71% is the change from 255 to 192
Calculation steps:
[( 192 - 255 ) ÷ 255] x 100 = -24.71%
Formula
Percentage change = [(192 - 255) / 255] x 100
Subtract the new number by the original number
192 - 255 = -63
-63 ÷ 255 = -0.24705882352941178
-0.24705882352941178 x 100 = -24.71%