55.69% is the change from 255 to 397
Calculation steps:
[( 397 - 255 ) ÷ 255] x 100 = 55.69%
Formula
Percentage change = [(397 - 255) / 255] x 100
Subtract the new number by the original number
397 - 255 = 142
142 ÷ 255 = 0.5568627450980392
0.5568627450980392 x 100 = 55.69%