You want to build a two$-$asset portfolio which includes the risk$-$free asset and the market portfolio. You want the portfolio to have an expected return of $11\mathrm{.}5\%.$ The expected return on the risk$-$free asset is $4\%$ and the expected return on the market is $10\%.$ What is the portfolio weight on the risk$-$free asset?

possible answers:

a$.-0\mathrm{.}25$

b$.-1\mathrm{.}0$

c$.-1\mathrm{.}5$

d$.-0\mathrm{.}75$