-85.7% is the change from 839 to 120
Calculation steps:
[( 120 - 839 ) ÷ 839] x 100 = -85.7%
Formula
Percentage change = [(120 - 839) / 839] x 100
Subtract the new number by the original number
120 - 839 = -719
-719 ÷ 839 = -0.8569725864123957
-0.8569725864123957 x 100 = -85.7%