-52.39% is the change from 838 to 399
Calculation steps:
[( 399 - 838 ) ÷ 838] x 100 = -52.39%
Formula
Percentage change = [(399 - 838) / 838] x 100
Subtract the new number by the original number
399 - 838 = -439
-439 ÷ 838 = -0.5238663484486874
-0.5238663484486874 x 100 = -52.39%