Gary Whitmore is a high school sophomore. He currently has $7,500 in a money market account paying 5.65 percent annually. He plans to use this and his savings over the next four years to buy a car at the end of his sophomore year in college. He estimates that the car will cost him $12,000 in four years. How much should he invest in the money market account every year for the next four years if he wants to achieve his target?