Mantle Corporation is considering two equally risky investments: A $5,000 investment in preferred stock that yields 6.65%. A $5,000 investment in a corporate bond that ylelds 10.00% What is the breakeven corporate tax rate that makes the company indifferent between the two investments? Assume a 50.00% dividend exclusion for taxes on dividends. (Do not round your intermediate answer and round your final answer to two decimal places.) a: 49.816 b. 66.50 C.33.50% d. 50.19% e. 66.75