-88.02% is the change from 668 to 80
Calculation steps:
[( 80 - 668 ) ÷ 668] x 100 = -88.02%
Formula
Percentage change = [(80 - 668) / 668] x 100
Subtract the new number by the original number
80 - 668 = -588
-588 ÷ 668 = -0.8802395209580839
-0.8802395209580839 x 100 = -88.02%