-27.08% is the change from 879 to 641
Calculation steps:
[( 641 - 879 ) ÷ 879] x 100 = -27.08%
Formula
Percentage change = [(641 - 879) / 879] x 100
Subtract the new number by the original number
641 - 879 = -238
-238 ÷ 879 = -0.2707622298065984
-0.2707622298065984 x 100 = -27.08%