-42.78% is the change from 879 to 503
Calculation steps:
[( 503 - 879 ) ÷ 879] x 100 = -42.78%
Formula
Percentage change = [(503 - 879) / 879] x 100
Subtract the new number by the original number
503 - 879 = -376
-376 ÷ 879 = -0.42775881683731515
-0.42775881683731515 x 100 = -42.78%