-93.45% is the change from 870 to 57
Calculation steps:
[( 57 - 870 ) ÷ 870] x 100 = -93.45%
Formula
Percentage change = [(57 - 870) / 870] x 100
Subtract the new number by the original number
57 - 870 = -813
-813 ÷ 870 = -0.9344827586206896
-0.9344827586206896 x 100 = -93.45%