Ir'. Municipal bonds are currently offering investors a 10% return and corporate bonds with the same maturity and default risk are offering investors a 12% return. Municipal bonds are exempt from personal income tax while corporate bonds are not. [a] What is the after-tax return on municipal bonds for an investor in the 30% personal income tax bracket? lb) What is the aftervtax return on corporate bonds for an investor in the 30555 personal income tax bracket? {cl At what personal income tax rate would an investor be indifferent between corporate bonds and municipal bonds?I