-3.45% is the change from 869 to 839
Calculation steps:
[( 839 - 869 ) ÷ 869] x 100 = -3.45%
Formula
Percentage change = [(839 - 869) / 869] x 100
Subtract the new number by the original number
839 - 869 = -30
-30 ÷ 869 = -0.03452243958573072
-0.03452243958573072 x 100 = -3.45%