Suppose that Loki started out his investment with $50 at the beginning of 2018. Loki did not invest any additional amount at the beginning of 2019. Later on, he deposited an additional $500 at the beginning 2020. Loki liquidated his holdings and cashed out of the investments at the end of 2020. Following is the historical actual annual returns from the S&P 500 index 2018: loss of 4.38% 2019: gain of 31.49% 2020: gain of 18.40% Answer the following: (1) Calculate Loki's dollar-weighted average. (2) What does the number that you have calculated in (1) means in plain English? (the objective is to have NO blind number here, whatever we calculate, we want to be able to explain in plain English such as an average college students can understand).