-98.63% is the change from 878 to 12
Calculation steps:
[( 12 - 878 ) ÷ 878] x 100 = -98.63%
Formula
Percentage change = [(12 - 878) / 878] x 100
Subtract the new number by the original number
12 - 878 = -866
-866 ÷ 878 = -0.9863325740318907
-0.9863325740318907 x 100 = -98.63%