-23.92% is the change from 878 to 668
Calculation steps:
[( 668 - 878 ) ÷ 878] x 100 = -23.92%
Formula
Percentage change = [(668 - 878) / 878] x 100
Subtract the new number by the original number
668 - 878 = -210
-210 ÷ 878 = -0.23917995444191345
-0.23917995444191345 x 100 = -23.92%