Xyz stock price and dividend history are as follows: year beginning-of-year price dividend paid at year-end 2015 $ 140 $ 4 2016 159 4 2017 132 4 2018 137 4 an investor buys five shares of xyz at the beginning of 2015, buys another three 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.)