please help!! i don't understand how to get the answer

1) Suppose that YourCo has the following ownership structure: Founders: 80,000 shares Employee stock option pool: 10,000 shares A Business Angel offers to invest $100,000 for a third of the company. What is the number of outstanding shares after the investment? A) 90,000 B) 100,000 C) 110,000 D) 120,000 E) 135,000 2) Suppose that YourCo has the following ownership structure: Founders: 80,000 shares Employee stock option pool: 10,000 shares A Business Angel offers to invest $100,000 for a third of the company. What is the post-money valuation of the company? A) $ 200,000 B) $ 300,000 C) $ 400,000 D) $ 500,000 E) $ 600,000 3) Suppose that YourCo has the following ownership structure: Founders: 80,000 shares Employee stock option pool: 10,000 shares A Business Angel offers to invest $100,000 for a third of the company. What is the pre-money valuation of the company? A) $ 200,000 B) $ 150,000 C) $ 135,000 D) $ 120,000 E) $ 100,000