-98.85% is the change from 870 to 10
Calculation steps:
[( 10 - 870 ) ÷ 870] x 100 = -98.85%
Formula
Percentage change = [(10 - 870) / 870] x 100
Subtract the new number by the original number
10 - 870 = -860
-860 ÷ 870 = -0.9885057471264368
-0.9885057471264368 x 100 = -98.85%