Notes:
1. Terminal Value (at time of exit)
2. Time to exit event
3. Amount of investment
4. Discount return used by investors
5. Number of existing shares (owned by the entrepreneurs)
6. Post-Money Valuation: POST = V/(1+r)^t
7. Pre-Money Valuation: PRE = POST - 1
8. Required ownership fraction for the investor: F = I / POST
9. Number of shares the investors require to achieve their desired ownership fraction: y = x[F/(1-F)]
10. Price per share: p = I / y