11000% is the change from 9 to 999
Calculation steps:
[( 999 - 9 ) ÷ 9] x 100 = 11000%
Formula
Percentage change = [(999 - 9) / 9] x 100
Subtract the new number by the original number
999 - 9 = 990
990 ÷ 9 = 110
110 x 100 = 11000%
Example