29.1% is the change from 646 to 834
Calculation steps:
[( 834 - 646 ) ÷ 646] x 100 = 29.1%
Formula
Percentage change = [(834 - 646) / 646] x 100
Subtract the new number by the original number
834 - 646 = 188
188 ÷ 646 = 0.29102167182662536
0.29102167182662536 x 100 = 29.1%