9233.33% is the change from 9 to 840
Calculation steps:
[( 840 - 9 ) ÷ 9] x 100 = 9233.33%
Formula
Percentage change = [(840 - 9) / 9] x 100
Subtract the new number by the original number
840 - 9 = 831
831 ÷ 9 = 92.33333333333333
92.33333333333333 x 100 = 9233.33%