Assume stock price and dividend history of a company are as follows: Year Beginning-of-Year Price Dividend Paid at Year-End 2016 $125 2017 $141 2018 $120 2019 $125 An investor buys six shares of this stock at the beginning of 2016, buys another three shares at the beginning of 2017, sells one share at the beginning of 2018, and sells all eight remaining shares at the beginning of 2019. a. What are the arithmetic and geometric average time-weighted rates of return for the investor? b. What is the dollar-weighted rate of return