19.72% is the change from 644 to 771
Calculation steps:
[( 771 - 644 ) ÷ 644] x 100 = 19.72%
Formula
Percentage change = [(771 - 644) / 644] x 100
Subtract the new number by the original number
771 - 644 = 127
127 ÷ 644 = 0.1972049689440994
0.1972049689440994 x 100 = 19.72%