A stock has a beta of $1\mathrm{.}10$ and an expected return of $12$ percent. A risk$-$free asset currently earns $2\mathrm{.}6$ percent.

a$.$

What is the expected return on a portfolio that is equally invested in the two assets? $($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$

If a portfolio of the two assets has a beta of $\mathrm{.}77,$ what are the portfolio weights? $($Do not round intermediate calculations and round your answers to $4$ decimal places, e$.$g$.,\mathrm{.}1616.)$

c$.$

If a portfolio of the two assets has an expected return of $9$ percent, what is its beta? $($Do not round intermediate calculations and round your answer to $3$ decimal places, e$.$g$.,32\mathrm{.}161.)$

d$.$

If a portfolio of the two assets has a beta of $2\mathrm{.}20,$ what are the portfolio weights?