-49.88% is the change from 838 to 420
Calculation steps:
[( 420 - 838 ) ÷ 838] x 100 = -49.88%
Formula
Percentage change = [(420 - 838) / 838] x 100
Subtract the new number by the original number
420 - 838 = -418
-418 ÷ 838 = -0.4988066825775656
-0.4988066825775656 x 100 = -49.88%