XYZ stock price and dividend history are as follows: An investor buys four shares of XYZ at the beginning of 2018, buys another two shares at the beginning of 2019 , sells one share at the beginning of 2020, and sells all five 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.)