-39.69% is the change from 839 to 506
Calculation steps:
[( 506 - 839 ) ÷ 839] x 100 = -39.69%
Formula
Percentage change = [(506 - 839) / 839] x 100
Subtract the new number by the original number
506 - 839 = -333
-333 ÷ 839 = -0.39690107270560193
-0.39690107270560193 x 100 = -39.69%