3.71% is the change from 809 to 839
Calculation steps:
[( 839 - 809 ) ÷ 809] x 100 = 3.71%
Formula
Percentage change = [(839 - 809) / 809] x 100
Subtract the new number by the original number
839 - 809 = 30
30 ÷ 809 = 0.037082818294190356
0.037082818294190356 x 100 = 3.71%