An Introduction to Management Science 13th Edition by David Anderson,Dennis Sweeney ,Thomas Williams ,Jeffrey Camm, Kipp Martin

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DJS Investment Services must develop an investment portfolio for a new client. As an initial investment strategy, the new client would like to restrict the portfolio to a mix of two stocks:
The client wants to invest $50,000 and established the following two investment goals;
Priority Level 1 Goal
Goal 1 : Obtain an annual return of at least 9%.
Priority Level 2 Goal
Goal 2 : Limit the investment in Key Oil, the riskier investment, to no more than 60% of the total investment.
a. Formulate a goal programming model for the DJS Investment problem.
b. Use the graphical goal programming procedure to obtain a solution.