You have $2,000 that you want to invest at the beginning of each of 5 years. The following alternatives are available to you:

• An investment that pays 7 percent for year 1, 6 percent for year 2, 5 percent for year 3, 4 percent for year 4, and 3 percent for year 5.
• An account that pays 3 percent for year 1, 4 percent for year 2, 5 percent for year 3, 6 percent for year 4, and 7 percent for year 5.
• An account that pays 5 percent per year each year.
On the basis of available balance at the end of year 5, which alternative is the best choice?