29.24% is the change from 643 to 831
Calculation steps:
[( 831 - 643 ) ÷ 643] x 100 = 29.24%
Formula
Percentage change = [(831 - 643) / 643] x 100
Subtract the new number by the original number
831 - 643 = 188
188 ÷ 643 = 0.29237947122861585
0.29237947122861585 x 100 = 29.24%