Different investor weights. Two risky portfolios exist for investing: one is a bond portfolio with

a beta of $0\mathrm{.}6$ and an expected return of $6\mathrm{.}1\%,$ and the other is an equity portfolio with a beta of

$1\mathrm{.}4$ and an expected return of $14\mathrm{.}4\%.$ If these portfolios are the only two available assets

for investing, what combination of these two assets will give the following investors their desired

level of expected return? What is the beta of each investor's combined bond and

equity portfolio?

a$.$ Bart: desired expected return $13\%$

b$.$ Lisa: desired expected return $11\%$

c$.$ Maggie: desired expected return $9\%$