XYZ stock price and dividend history are as follows: 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 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 ploces.) b-1. Prepare a chart of cash flows for the four dates corresponding to the turns of the year for January 1,2015, to January 1,2018 (Negotlve amounts should be indicated by o minus sign.) b-2. What is the dollar-weighted rate of return? (Hint: If your calculator cannot calculate internal rate of return, you will have to use a spreadsheet or trial and error) (Negotive volue should be indicated by o minus sign. Round your answer to 4 decimol places.)