There is simply no way to tell. It all depends on how many shares there are at the time you sell. VC funding can change this. Do you know how many shares there are today?
If there is a 25B valuation and 25B shares at the time of sale, your shares would be worth 20K (and you overpaid).
If there is a 25B valuation and 25 million shares, you would be worth 20M
According to the stock options plan document, there are 2.5M shares reserved for issuance for the plan. Of course, that says nothing about total shares.
