8.66% is the change from 820 to 891
Calculation steps:
[( 891 - 820 ) ÷ 820] x 100 = 8.66%
Formula
Percentage change = [(891 - 820) / 820] x 100
Subtract the new number by the original number
891 - 820 = 71
71 ÷ 820 = 0.08658536585365853
0.08658536585365853 x 100 = 8.66%