A car rental agency uses 96 boxes of staples a year. The boxes cost \($4\) each. It costs \($10\) to order staples, and it costs \($0.80\) to hold a box of staples in inventory for 1 year. Using the order size that minimizes the car rental agency's combined order- ing and holding costs for staples, how much does the car rental agency actually spend on holding costs for staples each year?