-98.29% is the change from 878 to 15
Calculation steps:
[( 15 - 878 ) ÷ 878] x 100 = -98.29%
Formula
Percentage change = [(15 - 878) / 878] x 100
Subtract the new number by the original number
15 - 878 = -863
-863 ÷ 878 = -0.9829157175398633
-0.9829157175398633 x 100 = -98.29%