21.21% is the change from 646 to 783
Calculation steps:
[( 783 - 646 ) ÷ 646] x 100 = 21.21%
Formula
Percentage change = [(783 - 646) / 646] x 100
Subtract the new number by the original number
783 - 646 = 137
137 ÷ 646 = 0.21207430340557276
0.21207430340557276 x 100 = 21.21%