-97.65% is the change from 851 to 20
Calculation steps:
[( 20 - 851 ) ÷ 851] x 100 = -97.65%
Formula
Percentage change = [(20 - 851) / 851] x 100
Subtract the new number by the original number
20 - 851 = -831
-831 ÷ 851 = -0.9764982373678026
-0.9764982373678026 x 100 = -97.65%