28.88% is the change from 644 to 830
Calculation steps:
[( 830 - 644 ) ÷ 644] x 100 = 28.88%
Formula
Percentage change = [(830 - 644) / 644] x 100
Subtract the new number by the original number
830 - 644 = 186
186 ÷ 644 = 0.2888198757763975
0.2888198757763975 x 100 = 28.88%