9.39% is the change from 820 to 897
Calculation steps:
[( 897 - 820 ) ÷ 820] x 100 = 9.39%
Formula
Percentage change = [(897 - 820) / 820] x 100
Subtract the new number by the original number
897 - 820 = 77
77 ÷ 820 = 0.09390243902439024
0.09390243902439024 x 100 = 9.39%