-85.29% is the change from 680 to 100
Calculation steps:
[( 100 - 680 ) ÷ 680] x 100 = -85.29%
Formula
Percentage change = [(100 - 680) / 680] x 100
Subtract the new number by the original number
100 - 680 = -580
-580 ÷ 680 = -0.8529411764705882
-0.8529411764705882 x 100 = -85.29%