12.36% is the change from 809 to 909
Calculation steps:
[( 909 - 809 ) ÷ 809] x 100 = 12.36%
Formula
Percentage change = [(909 - 809) / 809] x 100
Subtract the new number by the original number
909 - 809 = 100
100 ÷ 809 = 0.12360939431396786
0.12360939431396786 x 100 = 12.36%