225.88% is the change from 255 to 831
Calculation steps:
[( 831 - 255 ) ÷ 255] x 100 = 225.88%
Formula
Percentage change = [(831 - 255) / 255] x 100
Subtract the new number by the original number
831 - 255 = 576
576 ÷ 255 = 2.2588235294117647
2.2588235294117647 x 100 = 225.88%