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 long will a single order of staples last the agency, before it must receive more staples? (Assume there are 52 weeks in the year for the car rental agency.)