Just to clarify, it's not an 80x return or even close. I think you may have gotten that by taking the money in ($250k) and looking at the exit price ($20mln).
The truth is that if the round was priced, then the investors took call it 25% of the company, meaning the post-money was $1mln and thus at a $20 mln exit there was a 20x return... which of course is still pretty good.
The truth is that if the round was priced, then the investors took call it 25% of the company, meaning the post-money was $1mln and thus at a $20 mln exit there was a 20x return... which of course is still pretty good.