XYZ's stock price and dividend history are as follows: An Investor buys three shares of XYZ at the beginning of 2019 , buys another two shares at the beginning of 2020 , sells one share at the beginning of 2021 , and sells all four remaining shares at the beginning of 2022. Required: a. What are the arithmetic and geometric average time-weighted rates of return for the Investor? (Round your yearby-year rates of return and final answers to 2 decimal places. Do not round other calculations.) b. What is the dollar-weighted rate of return? (Hint. Carefully prepare a chart of cash flows for the four dates corresponding to the turns of the year for January 1, 2019, to January 1, 2022. If your calculator cannot calculate IRR, you will have to use trial and error or a spreadsheet program.) (Round your answer to 4 decimal places. Negatlve amount should be Indlcated by a minus sign.)