-70.88% is the change from 879 to 256
Calculation steps:
[( 256 - 879 ) ÷ 879] x 100 = -70.88%
Formula
Percentage change = [(256 - 879) / 879] x 100
Subtract the new number by the original number
256 - 879 = -623
-623 ÷ 879 = -0.7087599544937428
-0.7087599544937428 x 100 = -70.88%