-95.52% is the change from 870 to 39
Calculation steps:
[( 39 - 870 ) ÷ 870] x 100 = -95.52%
Formula
Percentage change = [(39 - 870) / 870] x 100
Subtract the new number by the original number
39 - 870 = -831
-831 ÷ 870 = -0.9551724137931035
-0.9551724137931035 x 100 = -95.52%