After completing this finance class, you begin to realize that you need to save more aggressively for retirement. You just sold one of your cars for $20,000 and plan on using this money to invest. In addition to the $20,000, you plan on saving $18,000 a year each year for the next 30 years. The investments will earn 8% annually. After solving for the future value of this investment ,you are blown away by how large the investment will be in 30 years.

You can invest the $18,000 at the beginning of each year OR at the end of each year. What is the difference in the future value depending on if you save the $18,000 at the beginning of the year or at the end of the year?