put True or false and justify why False ?

11- The main difference between the cost of common stock and the cost retained earnings is growth rate. 12- If expected EBIT is more than financial break-even point, its prefer to issuing bonds 13- Companys growth rate play an important role in calculating cost of bonds.

14- Market interest rate (discount rate) has no impact on the value of zero coupon rate. 15- According to Net Operating Income Approach (NOI approach) there is no optimal capital structure.