19.97% is the change from 646 to 775
Calculation steps:
[( 775 - 646 ) ÷ 646] x 100 = 19.97%
Formula
Percentage change = [(775 - 646) / 646] x 100
Subtract the new number by the original number
775 - 646 = 129
129 ÷ 646 = 0.1996904024767802
0.1996904024767802 x 100 = 19.97%