29.7% is the change from 643 to 834
Calculation steps:
[( 834 - 643 ) ÷ 643] x 100 = 29.7%
Formula
Percentage change = [(834 - 643) / 643] x 100
Subtract the new number by the original number
834 - 643 = 191
191 ÷ 643 = 0.29704510108864696
0.29704510108864696 x 100 = 29.7%