-98.29% is the change from 879 to 15
Calculation steps:
[( 15 - 879 ) ÷ 879] x 100 = -98.29%
Formula
Percentage change = [(15 - 879) / 879] x 100
Subtract the new number by the original number
15 - 879 = -864
-864 ÷ 879 = -0.9829351535836177
-0.9829351535836177 x 100 = -98.29%