12.32% is the change from 820 to 921
Calculation steps:
[( 921 - 820 ) ÷ 820] x 100 = 12.32%
Formula
Percentage change = [(921 - 820) / 820] x 100
Subtract the new number by the original number
921 - 820 = 101
101 ÷ 820 = 0.12317073170731707
0.12317073170731707 x 100 = 12.32%