A founder owns 100% of her startup. She is offered an equity investment by a VC investor, accepts, and eventually, undergoes two more rounds of financing, each time by another VC investor.

The financing events are as follows:

Round 1: VC investor 1 steps in with $0.5 million at a pre-money value of $2 million

Round 2: VC investor 2 contributes $3 million at a pre-money of $7 million

Round 3: VC investor 3 coughs up $5 million at a pre-money of $20 million.

At that point (Round 3), what is the worth in stock of the founder, of VC1, of VC2, and of VC3?

What percentage of the company does each own?