200.39% is the change from 255 to 766
Calculation steps:
[( 766 - 255 ) ÷ 255] x 100 = 200.39%
Formula
Percentage change = [(766 - 255) / 255] x 100
Subtract the new number by the original number
766 - 255 = 511
511 ÷ 255 = 2.003921568627451
2.003921568627451 x 100 = 200.39%