Appropriate Value for a Still Modern But Already a Junk Car?

How many percent off should its value be from the current market value?

Not flooded but generally tinambak lang ang oto.

Say, a 1998 Mitsubishi Lancer GSR and a 2001-05 Toyota Corolla Altis.

Anong magandang deal yung hindi ka naman malulugi sa hassle of restoration etc?