91.37% is the change from 255 to 488
Calculation steps:
[( 488 - 255 ) ÷ 255] x 100 = 91.37%
Formula
Percentage change = [(488 - 255) / 255] x 100
Subtract the new number by the original number
488 - 255 = 233
233 ÷ 255 = 0.9137254901960784
0.9137254901960784 x 100 = 91.37%