Challenge 3. (14 Points) Use the concepts/methods related to the lectures on Choosing a Discount Rate to address the following challenge: Anna K, a Russian firm specializing in railway safety systems, borrows money at 8% and its stock is priced by the market to provide a 20% return. The company's debt/equity ratio is currently 3. Question 3.a. (14 Points) What discount rate should the company use to evaluate new projects so as to at least cover its weighted average cost of capital? Justify decision and show any computations