Can someone solve a and b please?

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 year-by-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. Negative amount should be indicated by a minus sign.)