-6.67% is the change from 899 to 839
Calculation steps:
[( 839 - 899 ) ÷ 899] x 100 = -6.67%
Formula
Percentage change = [(839 - 899) / 899] x 100
Subtract the new number by the original number
839 - 899 = -60
-60 ÷ 899 = -0.06674082313681869
-0.06674082313681869 x 100 = -6.67%