XYZ stock price and dividend history are as follows: Year 2015 2016 2017 2018 Beginning-of-Year Price $100 110 90 95 Dividend Paid at Year-End $4 4 4 4 An investor buys three shares of XYZ at the beginning of 2015, buys another two shares at the beginning of 2016, sells one share at the beginning of 2017, and sells all four remaining shares at the beginning of 2018. 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.) Arithmetic mean Geometric mean % %