-98.93% is the change from 839 to 9
Calculation steps:
[( 9 - 839 ) ÷ 839] x 100 = -98.93%
Formula
Percentage change = [(9 - 839) / 839] x 100
Subtract the new number by the original number
9 - 839 = -830
-830 ÷ 839 = -0.9892729439809297
-0.9892729439809297 x 100 = -98.93%