28.64% is the change from 646 to 831
Calculation steps:
[( 831 - 646 ) ÷ 646] x 100 = 28.64%
Formula
Percentage change = [(831 - 646) / 646] x 100
Subtract the new number by the original number
831 - 646 = 185
185 ÷ 646 = 0.28637770897832815
0.28637770897832815 x 100 = 28.64%