2.8% is the change from 820 to 843
Calculation steps:
[( 843 - 820 ) ÷ 820] x 100 = 2.8%
Formula
Percentage change = [(843 - 820) / 820] x 100
Subtract the new number by the original number
843 - 820 = 23
23 ÷ 820 = 0.02804878048780488
0.02804878048780488 x 100 = 2.8%