21.31% is the change from 643 to 780
Calculation steps:
[( 780 - 643 ) ÷ 643] x 100 = 21.31%
Formula
Percentage change = [(780 - 643) / 643] x 100
Subtract the new number by the original number
780 - 643 = 137
137 ÷ 643 = 0.2130637636080871
0.2130637636080871 x 100 = 21.31%