-50.18% is the change from 839 to 418
Calculation steps:
[( 418 - 839 ) ÷ 839] x 100 = -50.18%
Formula
Percentage change = [(418 - 839) / 839] x 100
Subtract the new number by the original number
418 - 839 = -421
-421 ÷ 839 = -0.5017878426698451
-0.5017878426698451 x 100 = -50.18%