50.82% is the change from 551 to 831
Calculation steps:
[( 831 - 551 ) ÷ 551] x 100 = 50.82%
Formula
Percentage change = [(831 - 551) / 551] x 100
Subtract the new number by the original number
831 - 551 = 280
280 ÷ 551 = 0.5081669691470054
0.5081669691470054 x 100 = 50.82%