-6.71% is the change from 879 to 820
Calculation steps:
[( 820 - 879 ) ÷ 879] x 100 = -6.71%
Formula
Percentage change = [(820 - 879) / 879] x 100
Subtract the new number by the original number
820 - 879 = -59
-59 ÷ 879 = -0.0671217292377702
-0.0671217292377702 x 100 = -6.71%