XYZ stock price and dividend history are as follows: An investor buys six shares of XYZ at the beginning of 2018, buys another two shares at the beginning of 2019, sells one share a the beginning of 2020, and sells all seven remaining shares at the beginning of 2021. Required: a. What are the arithmetic and geometric average time-weighted rates of return for the investor? (Do not round intermediate calculations. Round your answers to 2 decimal places.) b-1. Prepare a chart of cash flows for the four dates corresponding to the turns of the year for January 1, 2018, to January 1, 2021. (Negative amounts should be indicated by a minus sign.) Answer is complete but not entirely correct. b-2. What is the dollar-weighted rate of return? (Hint: If your calculator cannot calculate internal rate of return, you will have to use a spreadsheet or trial and error.) (Negative value should be indicated by a minus sign. Round your answer to 4 decimal places.) Answer is complete but not entirely correct