3.05% is the change from 820 to 845
Calculation steps:
[( 845 - 820 ) ÷ 820] x 100 = 3.05%
Formula
Percentage change = [(845 - 820) / 820] x 100
Subtract the new number by the original number
845 - 820 = 25
25 ÷ 820 = 0.03048780487804878
0.03048780487804878 x 100 = 3.05%