XYZ's stock price and dividend history are as follows:

YearBeginning-of-Year PriceDividend Paid at Year-End2016$120$5201715052018110520191205

An investor buys three shares of XYZ at the beginning of 2016, buys another two shares at the beginning of 2017, sells one share at the beginning of 2018, and sells all four remaining shares at the beginning of 2019.

a.What are the arithmetic and geometric average time-weighted rates of return for the investor?(Round your year-by-year rates of return and final answer to 2 decimal places. Do not round other calculations.)

b.What is the dollar-weighted rate of return? (Hint: Carefully a chart of cash flows for thefourdates corresponding to the turns of the year for January 1, 2016, to January 1, 2019. If your calculator cannot calculate internal rate of return, you will have to use trial and error.)(Round your answers to 4 decimal places. Negative amount should be indicated by a minus sign.)