-49.82% is the change from 837 to 420
Calculation steps:
[( 420 - 837 ) ÷ 837] x 100 = -49.82%
Formula
Percentage change = [(420 - 837) / 837] x 100
Subtract the new number by the original number
420 - 837 = -417
-417 ÷ 837 = -0.4982078853046595
-0.4982078853046595 x 100 = -49.82%