-40.73% is the change from 879 to 521
Calculation steps:
[( 521 - 879 ) ÷ 879] x 100 = -40.73%
Formula
Percentage change = [(521 - 879) / 879] x 100
Subtract the new number by the original number
521 - 879 = -358
-358 ÷ 879 = -0.4072810011376564
-0.4072810011376564 x 100 = -40.73%