math,

. Mr. David, an individual investor, has $70,000to divide among several investments. The alternative investments are municipal bonds with an 8.5% annual return, certificates of deposit with a 5% return, treasury bills with a 6.5% return, and a growth stock fund with a 13% return. The investments are all evaluated after one year. However, each investment alternative has a different perceived risk to the investor; thus, it is advisable to diversify. David wants to know how much to invest in each alternative in order to maximize the return.
a) The following guidelines have been established for diversifying the investments and lessening the risk perceived by the investor.
b) No more than 20% of the total investment should be in municipal bonds.
c) The amount invested in certificates of deposit should not exceed the amount invested in the other three alternatives
d) At least 30% of the investment should be in treasury bills and certificates of deposit.
e) To be safe, more should be invested in certificates of deposit and treasury bills than in municipal bonds and the growth stock fund by a ratio of at least 1.2 to 1.
Required: If David wants to invest the entire $70,000, formulate the Linear Programming Model

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  1. Just write algebra for the conditions. Let

    w = municipal bonds
    x = CD's
    y = T-Bills
    z = Stocks

    Then the conditions are

    w <= (w+x+y+z)/5
    x <= w, x <= y, x <= z
    x+y >= 3/10 (w+x+y+z)
    x+y >= 1.2(w+z)

    Rearrange things a bit, and you want to

    maximize p = .085w+.05x+.065y+.13z
    subject to

    4w <= x+y+z
    3x <= w+y+z
    7x+7y >= 3w+3z
    6x+6y >= 5w+5z

    the constraints could be massaged into other forms if you like.

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