134.9% is the change from 255 to 599
Calculation steps:
[( 599 - 255 ) ÷ 255] x 100 = 134.9%
Formula
Percentage change = [(599 - 255) / 255] x 100
Subtract the new number by the original number
599 - 255 = 344
344 ÷ 255 = 1.3490196078431373
1.3490196078431373 x 100 = 134.9%