Please show full workings on excel.

Genjamin Braham and Barren Wuffett are two fund managers with below performance statistics for past 5 years. [3 points) Mean return Standard deviation Genjamin Braham 14% 16% Barren Wuffett 12% 11% Risk-free rate 3% a. Use the Sharpe ratio to determine which fund manager is better. b. How would you construct a portfolio with standard deviation of 16% using Barren Wuffett's fund and Risk-free asset? C. Calculate the average return of portfolio constructed in part b