Mantle Corporation is considering two equally risky investments: A $5,000 investment in preferred stock that yields 6.75%. A $5,000 investment in a corporate bond that yields 10.00%. What is the breakeven corporate tax rate that makes the company indifferent between the two investments? Assume a 70.00% dividend exclusion for tax on dividends. (Do not round your intermediate answer and round your final answer to two decimal places.) a. 50.13% b. 46.87% O c. 37.08% d. 34.23% e. 40.75%