Please show ALL work for calculating the Holding period for Letter A, B, and C. Thanks!!! Please don't just give me the percents of the holding period... but actually how to get the holding period as I'm a bit confused.

1. ( 30 pts) Portfolio Return. At the beginning of 2019 , you invested $20,000 in Stock M, trading at $20 per share. The stock earned a return of 14% in 2019,20% in 2020,8% in 2021 . Assume the risk-free rate is 3% per year. What was the holding period return from start of 2019 to end of 2021 if you had formed the following portfolios: (a) Buy 500 shares of Stock M, invest remainder at the risk-free rate: (b) Buy 2,000 shares of Stock M on margin, borrowing at the risk-free rate: (c) Short-sell 1,000 shares of Stock M, invest remainder at the risk free rate