23.53% is the change from 255 to 315
Calculation steps:
[( 315 - 255 ) ÷ 255] x 100 = 23.53%
Formula
Percentage change = [(315 - 255) / 255] x 100
Subtract the new number by the original number
315 - 255 = 60
60 ÷ 255 = 0.23529411764705882
0.23529411764705882 x 100 = 23.53%