You purchased 1,000 share of stock X by the end of 2013 for $50 per share, and the stock price has changed by the end of each year till last year as follows, assume no dividend paid during these years: a) What was your holding-period returns for three years? b) What was your annual internal rate of return? c) What is the standard deviation of returns of your investment? d) If stock Y has a same average return but the standard deviation of returns is 5%, which stock is a better investment? Year Price 2013 50 2014 52 2015 55 2016 60