-96.56% is the change from 871 to 30
Calculation steps:
[( 30 - 871 ) ÷ 871] x 100 = -96.56%
Formula
Percentage change = [(30 - 871) / 871] x 100
Subtract the new number by the original number
30 - 871 = -841
-841 ÷ 871 = -0.965556831228473
-0.965556831228473 x 100 = -96.56%