please formulate a clear linear programing model and solve using excel! or just give me the answer and i will solve it

1. An investment firm has $\$ 1$ million to invest in stocks, bonds, certificates of deposit, and real estate. The firm wishes to determine the mix of investments that will maximize the cash value at the end of 6 years. Opportunities to invest in stocks and bonds will be available at the beginning of each of the next 6 years. Each dollar invested in stocks will return $\$ 1.20$ (a profit of $\$ 0.20) 2$ years later, the retum $A$ can be immediately reinvested in any altemative. Bach dollar invested in bonds will return $\$ 1,40$ 3 years later, the return can be reinvested immediately. Opportunities to invest in certificates of deposit will be available only once, at the beginning of the second year. Each dollar invested in certificates will return $\$ 1.80$ four years later. Opportunitier to invest in real estate will be available at the beginning of the fifth and sixth years. Each dollar invested will retum $\$ 1.10$ one year later. To minimize risk, the firm has decided to diversify its investments. The total amount invested in stocks cannot exceed $30 \%$ of total investments, and at least $25 \%$ of total investments must be in certificates of deposit. The firm's management wishes to determine the optimal mix of invesments in the various alternatives that will maximize the amount of cash at the end of the sixth year. a. Formulate a tinear programming model for this problem. b. Solve the model by using the computer.

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