-39.38% is the change from 838 to 508
Calculation steps:
[( 508 - 838 ) ÷ 838] x 100 = -39.38%
Formula
Percentage change = [(508 - 838) / 838] x 100
Subtract the new number by the original number
508 - 838 = -330
-330 ÷ 838 = -0.3937947494033413
-0.3937947494033413 x 100 = -39.38%