-50.18% is the change from 843 to 420
Calculation steps:
[( 420 - 843 ) ÷ 843] x 100 = -50.18%
Formula
Percentage change = [(420 - 843) / 843] x 100
Subtract the new number by the original number
420 - 843 = -423
-423 ÷ 843 = -0.501779359430605
-0.501779359430605 x 100 = -50.18%