In the first three questions, we consider four stocks A, B, C and D whose price per share on 1 January 2020 and 31 December 2020 are shown in the following table. On 1 January 2020, an investor purchased the following numbers of shares of each stock and held them through 31 December 2020 What is the portfolio return over 2020 ? 4.89% 2.52% 0.48% 3.10%