-10.65% is the change from 939 to 839
Calculation steps:
[( 839 - 939 ) ÷ 939] x 100 = -10.65%
Formula
Percentage change = [(839 - 939) / 939] x 100
Subtract the new number by the original number
839 - 939 = -100
-100 ÷ 939 = -0.10649627263045794
-0.10649627263045794 x 100 = -10.65%