You still haven't explained where you're getting your numbers from. 70%, 20%? If they are only considering your offer, I doubt they threw out those numbers. Did you propose those numbers to them? What have they told you that makes you believe they're considering your offer? You don't have to be extremely detailed (well, you should be if you're asking for our help), but you already have a slim chance of getting any help on this - being vague doesn't help.