Can someone help me determine the correct responses to part a and b of this question?

XYZ stock price and dividend history are as follows: Year Beginning-of-Year Price 2010 $ 108 2011 $ 112 2012 $ 98 2013 $ 103 Dividend Paid at Year- End $ 4 $ 4 $ 4 $ 4 An investor buys four shares of XYZ at the beginning of 2010, buys another three shares at the beginning of 2011, sells one share at the beginning of 2012, and sells all six remaining shares at the beginning of 2013. a. What are the arithmetic and geometric average time-weighted rates of return for the investor? (Do not round intermediate calculations. Enter your answer as a percentage rounded to two decimal places.) Arithmetic average return Geometric average return % % b. To compute dollar-weighted return, prepare a chart of cash flows for the four dates corresponding to the turns of the year for January 1, 2010, to January 1, 2013. (Enter your answer as an integer. Negative amounts should be indicated by a minus sign.) Cash Flow (for the investor) Date 1/1/2010 1/1/2011 1/1/2012 1/1/2013