-80.72% is the change from 830 to 160
Calculation steps:
[( 160 - 830 ) ÷ 830] x 100 = -80.72%
Formula
Percentage change = [(160 - 830) / 830] x 100
Subtract the new number by the original number
160 - 830 = -670
-670 ÷ 830 = -0.8072289156626506
-0.8072289156626506 x 100 = -80.72%