-80.81% is the change from 839 to 161
Calculation steps:
[( 161 - 839 ) ÷ 839] x 100 = -80.81%
Formula
Percentage change = [(161 - 839) / 839] x 100
Subtract the new number by the original number
161 - 839 = -678
-678 ÷ 839 = -0.8081048867699643
-0.8081048867699643 x 100 = -80.81%