-86.22% is the change from 878 to 121
Calculation steps:
[( 121 - 878 ) ÷ 878] x 100 = -86.22%
Formula
Percentage change = [(121 - 878) / 878] x 100
Subtract the new number by the original number
121 - 878 = -757
-757 ÷ 878 = -0.8621867881548975
-0.8621867881548975 x 100 = -86.22%