Please use formulas instead of excel to solve this

8. Sparrow Corp. has $100 million face value of outstanding debt with a coupon of 10% and a yield to maturity of 8% (annualized). The bonds make semi-annual payments, and have 10 years to maturity. The company also has I million shares of common stock with book value per share of $35 and a market value per share of $50. The current beta of the stock is 1.5. The Treasury bill rate is 5%, and the market risk premium is 8.5%. The company is in the 40% tax bracket. What is the company's current weighted average cost of capital