30.79% is the change from 643 to 841
Calculation steps:
[( 841 - 643 ) ÷ 643] x 100 = 30.79%
Formula
Percentage change = [(841 - 643) / 643] x 100
Subtract the new number by the original number
841 - 643 = 198
198 ÷ 643 = 0.30793157076205285
0.30793157076205285 x 100 = 30.79%