-99.52% is the change from 839 to 4
Calculation steps:
[( 4 - 839 ) ÷ 839] x 100 = -99.52%
Formula
Percentage change = [(4 - 839) / 839] x 100
Subtract the new number by the original number
4 - 839 = -835
-835 ÷ 839 = -0.9952324195470799
-0.9952324195470799 x 100 = -99.52%