-24.72% is the change from 878 to 661
Calculation steps:
[( 661 - 878 ) ÷ 878] x 100 = -24.72%
Formula
Percentage change = [(661 - 878) / 878] x 100
Subtract the new number by the original number
661 - 878 = -217
-217 ÷ 878 = -0.24715261958997722
-0.24715261958997722 x 100 = -24.72%