8888.89% is the change from 9 to 809
Calculation steps:
[( 809 - 9 ) ÷ 9] x 100 = 8888.89%
Formula
Percentage change = [(809 - 9) / 9] x 100
Subtract the new number by the original number
809 - 9 = 800
800 ÷ 9 = 88.88888888888889
88.88888888888889 x 100 = 8888.89%