Whispering Pines Inc. is all-equity-financed. The expected rate of return on the company's shares is 12%. a. What is the opportunity cost of capital for an average-risk Whispering Pines investment? Opportunity cost of capital 12 % b. Suppose the company issues debt, repurchases shares, and moves to a 30% debt-to-value ratio (DIV = 0.30). What will be the company's weighted-average cost of capital at the new capital structure? The borrowing rate is 7.5% and the tax rate is 21%. (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Weighted-average cost of capital %