Kulood Jabbar has US$5,000 to invest. Because she is only 25 years old, she is not concerned about the length of the investment's life. What she is sensitive to is the rate of return she will earn on the investment. With the help of her financial adviser, Kulood has isolated four equally risky investments, each providing a single amount at the end of its life, as shown in the following table. All of the investments require an initial US$5,000 payment.

a. Calculate, to the nearest 1 percent, the rate of return on each of the four investments available to Kulood.
b. Which investment would you recommend to Kulood, given her goal of maximizing the rate of return?

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Investment life Investment Single amount (years) US$ 8,400 15,900 7,600 13,000 15 4 10