30.73% is the change from 641 to 838
Calculation steps:
[( 838 - 641 ) ÷ 641] x 100 = 30.73%
Formula
Percentage change = [(838 - 641) / 641] x 100
Subtract the new number by the original number
838 - 641 = 197
197 ÷ 641 = 0.3073322932917317
0.3073322932917317 x 100 = 30.73%