-38.02% is the change from 839 to 520
Calculation steps:
[( 520 - 839 ) ÷ 839] x 100 = -38.02%
Formula
Percentage change = [(520 - 839) / 839] x 100
Subtract the new number by the original number
520 - 839 = -319
-319 ÷ 839 = -0.3802145411203814
-0.3802145411203814 x 100 = -38.02%