In addition to risk-free securities, you are currently invested in the Tanglewood fund a broad-based, fund of stocks and other securities with an expected return of 14% and a volatility of 26%. Currently, the risk-free rate of interest is 3%. Your broker suggests that you add a venture capital fund to your current portfolio. The venture capital fund has an expected return of 22% a volatility of 79% and a correlation of 0.2. With the Tanglewood fund assume you follow your broker's advice and put 50% of your money in the venture fund:

A) What is the sharpe ratio of the Tanglewood fund Answer: 0.42

B) What is the sharpe ratio of your new portfolio Answer: 0.34

C) What is the optimal Sharpe ratio you can obtain by investing in the venture fund (hint: use excel in round your answer to two decimal places.)

I've figured out part A&B. The answer to Part A) is 0.42 and the Answer to Part B is 0.34.

I just don't understand part C. please clearly layout the steps for Part C. if you use excel please put cell references. I've entered this question into chegg two times and each expert has gotten it wrong so please be sure to double-check your work.