2.56% is the change from 820 to 841
Calculation steps:
[( 841 - 820 ) ÷ 820] x 100 = 2.56%
Formula
Percentage change = [(841 - 820) / 820] x 100
Subtract the new number by the original number
841 - 820 = 21
21 ÷ 820 = 0.025609756097560974
0.025609756097560974 x 100 = 2.56%