An investor is trying to decide between a muni paying 6.25 percent or an equivalent taxable corporate paying 8.75 percent. What is the minimum marginal tax rate the investor must have to consider buying the municipal bond? Select one: O 63.64 percent O 30.00 percent 28.57 percent O 40.00 percent 27.85 percent 36.36 percent O 25.87 percent