-51.85% is the change from 839 to 404
Calculation steps:
[( 404 - 839 ) ÷ 839] x 100 = -51.85%
Formula
Percentage change = [(404 - 839) / 839] x 100
Subtract the new number by the original number
404 - 839 = -435
-435 ÷ 839 = -0.5184743742550656
-0.5184743742550656 x 100 = -51.85%