XYZ's stock price and dividend history are as follows: Beginning-of-Year Price 100 Dividend Paid at Year Year-End S 4 4 2017 2018 120 2019 90 2020 100 An investor buys three shares of XYZ at the beginning of 2017, buys another two shares at the beginning of 2018, sells one share at the beginning of 2019, and sells all four remaining shares at the beginning of 2020. a. What are the arithmetic and geometric average time-weighted rates of return for the investor? (Round your year-by-year rates of return and finel answer to 2 declmal pleces. Do not round other calculations.) Arithmetic average rate of return 96 Geometric average rate of retum b. What is the dollar-weighted rate of return? (Hint Carefully prepare a chart of cash flows for the fourdates corresponding to the turns of the year for January 1, 2017, to January 1, 2020. If your calculator cannot calculate IRR, you will have to use trial and error or a spreadsheet program.) (Round your answers to 4 decimal places. Negatlve amount should be indicated by a minus sign.) Dollar-weighted rate of return