Please help me with this question. It's due in a few hours

After selling 16.5 million shares in Fin-Tech's IPO founder David Smith received $867m which he wishes to invest wisely. He has contacted three young and very eager investment managers (LSE graduates) to research the market opportunities and propose an optimal investment portfolio. The best candidate will have the chance to become Smith's wealth manager. Mr Smith will not hire candidates that propose either inefficient or infeasible portfolios. Assume that all securities are priced according to the CAPM and that the risk free rate is 2%.The expected excess return on the market portfolio is 8% and the standard deviation is 20%.The three candidates proposed portfolios with the following characteristics:

Candidate Expected Return

Bo 8%

Michael 12%

Aditi 13%

Candidate standard deviation

Bo 10%

Micheal 25%

Aditi 30%

1. Who do you think will be hired by Mr Smith and why?

2. How can the expected return of the wining portfolio be achieved? Specify the amount invested in each asset/portfolio of assets?

3. What is the beta of the winning portfolio?

4. If Mr Smith holds his position for one year what is the total amount of money he expects to earn on his investment?