-39.14% is the change from 838 to 510
Calculation steps:
[( 510 - 838 ) ÷ 838] x 100 = -39.14%
Formula
Percentage change = [(510 - 838) / 838] x 100
Subtract the new number by the original number
510 - 838 = -328
-328 ÷ 838 = -0.3914081145584726
-0.3914081145584726 x 100 = -39.14%