please answer 11, 12 , and 13

11. An unlevered firm has 40 million shares outstanding and a stock price of $10. The firm plans to unexpectedly announce that it will issue $400 million in 10% coupon rate debt financing and use the proceeds to repurchase shares. The debt level is expected to remain at this level. There are no corporate taxes. Calculate the firm's market value before the announcement. Market value =40,000,00010=$400,000,000 12. Using the same information as in question 11, calculate the market value of the firm after the debt is issued, but before the shares are repurchased. The firm's market value is the same, which is $400,000,000 13. Using the same information as in question 11, calculate the share price just before the share repurchase. How many shares will be repurchased at this price