9888.89% is the change from 9 to 899
Calculation steps:
[( 899 - 9 ) ÷ 9] x 100 = 9888.89%
Formula
Percentage change = [(899 - 9) / 9] x 100
Subtract the new number by the original number
899 - 9 = 890
890 ÷ 9 = 98.88888888888889
98.88888888888889 x 100 = 9888.89%