19.81% is the change from 646 to 774
Calculation steps:
[( 774 - 646 ) ÷ 646] x 100 = 19.81%
Formula
Percentage change = [(774 - 646) / 646] x 100
Subtract the new number by the original number
774 - 646 = 128
128 ÷ 646 = 0.19814241486068113
0.19814241486068113 x 100 = 19.81%