You have the following rates of return for a risky portfolio for several recent years. Assume that the stock pays no dividends. Year Beginning of Year #of shares bought Price or sold 2013 $50.00 100 bought 2014 $55.00 50 bought 2015 $51.00 75 sold 2016 $58.00 75 sold What is the dollar-weighted return over the entire time period? 2.48% O 0.74% 2.21% 2.60%