12.55% is the change from 255 to 287
Calculation steps:
[( 287 - 255 ) ÷ 255] x 100 = 12.55%
Formula
Percentage change = [(287 - 255) / 255] x 100
Subtract the new number by the original number
287 - 255 = 32
32 ÷ 255 = 0.12549019607843137
0.12549019607843137 x 100 = 12.55%