You currently have 50% of your wealth in a risk-free asset and 50% in the four assets

Question:

You currently have 50% of your wealth in a risk-free asset and 50% in the four assets below:

If you want an expected rate of return of 12%, you can obtain it by selling some of your holdings of the risk-free asset and using the proceeds to buy the equally weighted market portfolio. If this is the way you decide to revise your portfolio, what will the set of weights in your portfolio be? If you hold only the risk-free asset and the market portfolio, what set of weights would give you an expected 12% return?

Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...