-79.51% is the change from 820 to 168
Calculation steps:
[( 168 - 820 ) ÷ 820] x 100 = -79.51%
Formula
Percentage change = [(168 - 820) / 820] x 100
Subtract the new number by the original number
168 - 820 = -652
-652 ÷ 820 = -0.7951219512195122
-0.7951219512195122 x 100 = -79.51%