717.17% is the change from 99 to 809
Calculation steps:
[( 809 - 99 ) ÷ 99] x 100 = 717.17%
Formula
Percentage change = [(809 - 99) / 99] x 100
Subtract the new number by the original number
809 - 99 = 710
710 ÷ 99 = 7.171717171717172
7.171717171717172 x 100 = 717.17%