In the latter part of Section $5\mathrm{.}3$ we developed a moderate risk portfolio model for Hauck Investment Services. Modify the model given so that it can be used to construct a portfolio for more aggressive investors. In particular, do the following:

a$.$ Develop a portfolio model for investors who are willing to risk a portfolio with a retum as low as $0\%.$

b$.$ What is the recommended allocation for this type of investor?

c$.$ How would you modify your recommendation in part $($b$)$ for an investor who also wants to have at least $10\%$ of his or her portfolio invested in the foreign stock mutual fund? How does requiring at least $10\%$ of the portfolio be invested in the foreign stock fund affect the expected return?