27.17% is the change from 644 to 819
Calculation steps:
[( 819 - 644 ) ÷ 644] x 100 = 27.17%
Formula
Percentage change = [(819 - 644) / 644] x 100
Subtract the new number by the original number
819 - 644 = 175
175 ÷ 644 = 0.2717391304347826
0.2717391304347826 x 100 = 27.17%