4.2% is the change from 810 to 844
Calculation steps:
[( 844 - 810 ) ÷ 810] x 100 = 4.2%
Formula
Percentage change = [(844 - 810) / 810] x 100
Subtract the new number by the original number
844 - 810 = 34
34 ÷ 810 = 0.04197530864197531
0.04197530864197531 x 100 = 4.2%