-50.3% is the change from 839 to 417
Calculation steps:
[( 417 - 839 ) ÷ 839] x 100 = -50.3%
Formula
Percentage change = [(417 - 839) / 839] x 100
Subtract the new number by the original number
417 - 839 = -422
-422 ÷ 839 = -0.5029797377830751
-0.5029797377830751 x 100 = -50.3%