12.2% is the change from 820 to 920
Calculation steps:
[( 920 - 820 ) ÷ 820] x 100 = 12.2%
Formula
Percentage change = [(920 - 820) / 820] x 100
Subtract the new number by the original number
920 - 820 = 100
100 ÷ 820 = 0.12195121951219512
0.12195121951219512 x 100 = 12.2%