How do I solve this problem in excel? I started working on it, but I'm a bit stuck. Please show me how to do it, your help is greatly appreciated. Thumbs up guaranteed for best answer :)

Boatman's Bank of Cape Girardeau, Missouri, is trying to select an investment portfolio for a wealthy Missouri "Bootheel" cotton farmer. The bank has determined a set of five investment alternatives, with subjective estimates of rates of return and risk in the table below. The bank officer in charge of selecting the portfolio would like to maximize the average annual rate of return on the portfolio. However, the wealthy investor has specified that the average risk of the portfolio should not exceed 2.0 and does not want more than 20 percent of the investment to be put into real estate. Formulate the linear programming model and solve this problem. Annual rate of return Risk Tax-free municpal bonds Corporate bonds High Grade Common Stock Mutual Fund Real Estate