97.65% is the change from 255 to 504
Calculation steps:
[( 504 - 255 ) ÷ 255] x 100 = 97.65%
Formula
Percentage change = [(504 - 255) / 255] x 100
Subtract the new number by the original number
504 - 255 = 249
249 ÷ 255 = 0.9764705882352941
0.9764705882352941 x 100 = 97.65%