-99.09% is the change from 878 to 8
Calculation steps:
[( 8 - 878 ) ÷ 878] x 100 = -99.09%
Formula
Percentage change = [(8 - 878) / 878] x 100
Subtract the new number by the original number
8 - 878 = -870
-870 ÷ 878 = -0.9908883826879271
-0.9908883826879271 x 100 = -99.09%