Municipal bonds are currently offering investors a 6% return and corporate bonds with the same maturity and default risk are offering investors an 8% return.

(a) What is the after-tax return on municipal bonds for an investor in the 30% tax bracket?

(b) What is the after-tax return on corporate bonds for an investor in the 30% tax bracket?

(c) At what personal tax rate would an investor be indifferent between corporate bonds and municipal bonds?