161.81% is the change from 309 to 809
Calculation steps:
[( 809 - 309 ) ÷ 309] x 100 = 161.81%
Formula
Percentage change = [(809 - 309) / 309] x 100
Subtract the new number by the original number
809 - 309 = 500
500 ÷ 309 = 1.6181229773462784
1.6181229773462784 x 100 = 161.81%