-40.24% is the change from 845 to 505
Calculation steps:
[( 505 - 845 ) ÷ 845] x 100 = -40.24%
Formula
Percentage change = [(505 - 845) / 845] x 100
Subtract the new number by the original number
505 - 845 = -340
-340 ÷ 845 = -0.40236686390532544
-0.40236686390532544 x 100 = -40.24%