3.83% is the change from 809 to 840
Calculation steps:
[( 840 - 809 ) ÷ 809] x 100 = 3.83%
Formula
Percentage change = [(840 - 809) / 809] x 100
Subtract the new number by the original number
840 - 809 = 31
31 ÷ 809 = 0.038318912237330034
0.038318912237330034 x 100 = 3.83%