90.59% is the change from 255 to 486
Calculation steps:
[( 486 - 255 ) ÷ 255] x 100 = 90.59%
Formula
Percentage change = [(486 - 255) / 255] x 100
Subtract the new number by the original number
486 - 255 = 231
231 ÷ 255 = 0.9058823529411765
0.9058823529411765 x 100 = 90.59%