-98.97% is the change from 878 to 9
Calculation steps:
[( 9 - 878 ) ÷ 878] x 100 = -98.97%
Formula
Percentage change = [(9 - 878) / 878] x 100
Subtract the new number by the original number
9 - 878 = -869
-869 ÷ 878 = -0.989749430523918
-0.989749430523918 x 100 = -98.97%