-70.99% is the change from 879 to 255
Calculation steps:
[( 255 - 879 ) ÷ 879] x 100 = -70.99%
Formula
Percentage change = [(255 - 879) / 879] x 100
Subtract the new number by the original number
255 - 879 = -624
-624 ÷ 879 = -0.7098976109215017
-0.7098976109215017 x 100 = -70.99%