-26.65% is the change from 878 to 644
Calculation steps:
[( 644 - 878 ) ÷ 878] x 100 = -26.65%
Formula
Percentage change = [(644 - 878) / 878] x 100
Subtract the new number by the original number
644 - 878 = -234
-234 ÷ 878 = -0.26651480637813213
-0.26651480637813213 x 100 = -26.65%