How much should I sell my mustang for?

I bought a 2001 Ford Mustang back in November and just a couple months ago the gas tank fell off. It can t be re-attached an less the bottom is welded because it is rusted out. Unfortunately I do not have the money to fix it and I pretty much just need to get it off my hands at this point. I know I won t get much for it but how much should I sell it for as is?

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