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 at 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.)