-50.18% is the change from 845 to 421
Calculation steps:
[( 421 - 845 ) ÷ 845] x 100 = -50.18%
Formula
Percentage change = [(421 - 845) / 845] x 100
Subtract the new number by the original number
421 - 845 = -424
-424 ÷ 845 = -0.5017751479289941
-0.5017751479289941 x 100 = -50.18%