30.48% is the change from 643 to 839
Calculation steps:
[( 839 - 643 ) ÷ 643] x 100 = 30.48%
Formula
Percentage change = [(839 - 643) / 643] x 100
Subtract the new number by the original number
839 - 643 = 196
196 ÷ 643 = 0.3048211508553655
0.3048211508553655 x 100 = 30.48%