Suppose a number of your friends have organized a company to develop and sell a new software product. They have asked you to loan them $9,000 to help get the company started, and they have promised to repay your $9,000 plus 8% interest in one year. Of the following, which amount may be described as the return on your investment?

$720.

$8,280.

$9,720.

$9,000.