-80.49% is the change from 820 to 160
Calculation steps:
[( 160 - 820 ) ÷ 820] x 100 = -80.49%
Formula
Percentage change = [(160 - 820) / 820] x 100
Subtract the new number by the original number
160 - 820 = -660
-660 ÷ 820 = -0.8048780487804879
-0.8048780487804879 x 100 = -80.49%