4.10     An investment of $1,000 you made 4 years ago was worth $1,200 after the first year, $1,200 after the sec- ond year, $1,500 after the third year, and $2,000 today.

a.     Compute the annual rates of return.

b.     Compute the mean and median of the rates of return.

c.     Compute the geometric mean.

d.    Discuss whether the mean, median, or geometric mean is the best measure of the performance of the investment.