-39.74% is the change from 838 to 505
Calculation steps:
[( 505 - 838 ) ÷ 838] x 100 = -39.74%
Formula
Percentage change = [(505 - 838) / 838] x 100
Subtract the new number by the original number
505 - 838 = -333
-333 ÷ 838 = -0.39737470167064437
-0.39737470167064437 x 100 = -39.74%