-85.55% is the change from 851 to 123
Calculation steps:
[( 123 - 851 ) ÷ 851] x 100 = -85.55%
Formula
Percentage change = [(123 - 851) / 851] x 100
Subtract the new number by the original number
123 - 851 = -728
-728 ÷ 851 = -0.8554641598119859
-0.8554641598119859 x 100 = -85.55%