-49.76% is the change from 838 to 421
Calculation steps:
[( 421 - 838 ) ÷ 838] x 100 = -49.76%
Formula
Percentage change = [(421 - 838) / 838] x 100
Subtract the new number by the original number
421 - 838 = -417
-417 ÷ 838 = -0.49761336515513127
-0.49761336515513127 x 100 = -49.76%