-88.24% is the change from 680 to 80
Calculation steps:
[( 80 - 680 ) ÷ 680] x 100 = -88.24%
Formula
Percentage change = [(80 - 680) / 680] x 100
Subtract the new number by the original number
80 - 680 = -600
-600 ÷ 680 = -0.8823529411764706
-0.8823529411764706 x 100 = -88.24%