You have invested in a portfolio of AMZN stock and T-bills. The AMZN stock has an expected return of 16%, and the T-bill has a rate of return of 4%. Your portfolio has an expected return of 13%. What is the portfolio weight of the AMZN stock? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer a 0.25 b 0.30 C 0.55 d 0.70 e 0.75