Xyz stock price and dividend history are as follows: year beginning-of-year price dividend paid at year-end 2015 $ 122 $ 5 2016 132 5 2017 110 5 2018 115 5 an investor buys six 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 seven 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.)