-50% is the change from 838 to 419
Calculation steps:
[( 419 - 838 ) ÷ 838] x 100 = -50%
Formula
Percentage change = [(419 - 838) / 838] x 100
Subtract the new number by the original number
419 - 838 = -419
-419 ÷ 838 = -0.5
-0.5 x 100 = -50%
Example