-95.06% is the change from 851 to 42
Calculation steps:
[( 42 - 851 ) ÷ 851] x 100 = -95.06%
Formula
Percentage change = [(42 - 851) / 851] x 100
Subtract the new number by the original number
42 - 851 = -809
-809 ÷ 851 = -0.9506462984723855
-0.9506462984723855 x 100 = -95.06%