Final answer:
The post-money valuation is calculated by adding the amount of money received from stock sales to the market capitalization. The specific stock price is needed to determine the numerical value.
Step-by-step explanation:
The post-money valuation of a firm is calculated by adding the amount of money the firm has received from stock sales to its market capitalization, which is the product of the stock price and the total number of shares outstanding. In this case, the firm initially received $600,000 from the founder's contribution and sold 12,000,000 shares to angel investors. The firm is now raising $4,000,000 from a venture capitalist in exchange for 90,000,000 new shares. The post-money valuation is therefore calculated as follows:
Market Capitalization = (Initial Shares + Angel Investor Shares + Venture Capitalist Shares) * Stock Price = (3,000,000 + 12,000,000 + 90,000,000) * Stock Price
Post-Money Valuation = Market Capitalization + Amount from Stock Sales = (3,000,000 + 12,000,000 + 90,000,000) * Stock Price + $4,000,000
Since the exact stock price is not provided, the calculation cannot be performed to provide a numerical value for the post-money valuation.