How to solve using excel?

Luke Heckman has asked you to analyze the following investment alternatives for the highest after-tax rate of return under the assumption that the client is subject to a 28 percent marginal federal income tax and a 5 percent state income tax. A corporate bond with a 7 percent pretax return An out-of-state municipal bond with a 5.75 percent pretax return An in-state municipal bond with a 5.5 percent pretax return