78.82% is the change from 255 to 456
Calculation steps:
[( 456 - 255 ) ÷ 255] x 100 = 78.82%
Formula
Percentage change = [(456 - 255) / 255] x 100
Subtract the new number by the original number
456 - 255 = 201
201 ÷ 255 = 0.788235294117647
0.788235294117647 x 100 = 78.82%