-49.7% is the change from 845 to 425
Calculation steps:
[( 425 - 845 ) ÷ 845] x 100 = -49.7%
Formula
Percentage change = [(425 - 845) / 845] x 100
Subtract the new number by the original number
425 - 845 = -420
-420 ÷ 845 = -0.4970414201183432
-0.4970414201183432 x 100 = -49.7%