XYZ's stock price and dividend history are as follows: An investor buys three shares of XYZ at the beginning of 2018, bu

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XYZ's stock price and dividend history are as follows:
An investor buys three shares of XYZ at the beginning of 2018, buys
another two shares at the beginning of 2019, sells one share at the
beginning of 2020, and sells all four remaining shares at the
beginning of 2021.

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 answers to 2 decimal places. Do not round other
calculations.)
b. What is the dollar-weighted rate of
return? (Hint: Carefully prepare a chart of cash flows for
the four dates corresponding to the turns of the
year for January 1, 2018, to January 1, 2021. If your calculator
cannot calculate internal rate of return, you will have to use
trial and error.) (Round your answer to 4 decimal
places. Negative amount should be indicated by a minus
sign.)