15.73% is the change from 820 to 949
Calculation steps:
[( 949 - 820 ) ÷ 820] x 100 = 15.73%
Formula
Percentage change = [(949 - 820) / 820] x 100
Subtract the new number by the original number
949 - 820 = 129
129 ÷ 820 = 0.1573170731707317
0.1573170731707317 x 100 = 15.73%