-49.52% is the change from 840 to 424
Calculation steps:
[( 424 - 840 ) ÷ 840] x 100 = -49.52%
Formula
Percentage change = [(424 - 840) / 840] x 100
Subtract the new number by the original number
424 - 840 = -416
-416 ÷ 840 = -0.49523809523809526
-0.49523809523809526 x 100 = -49.52%