9500% is the change from 9 to 864
Calculation steps:
[( 864 - 9 ) ÷ 9] x 100 = 9500%
Formula
Percentage change = [(864 - 9) / 9] x 100
Subtract the new number by the original number
864 - 9 = 855
855 ÷ 9 = 95
95 x 100 = 9500%
Example