-26.42% is the change from 878 to 646
Calculation steps:
[( 646 - 878 ) ÷ 878] x 100 = -26.42%
Formula
Percentage change = [(646 - 878) / 878] x 100
Subtract the new number by the original number
646 - 878 = -232
-232 ÷ 878 = -0.2642369020501139
-0.2642369020501139 x 100 = -26.42%