-97.51% is the change from 845 to 21
Calculation steps:
[( 21 - 845 ) ÷ 845] x 100 = -97.51%
Formula
Percentage change = [(21 - 845) / 845] x 100
Subtract the new number by the original number
21 - 845 = -824
-824 ÷ 845 = -0.9751479289940829
-0.9751479289940829 x 100 = -97.51%