Hottenstein, Griffith, and Hult, attorneys at law, do a great deal of printing. The firm uses a single type of printer with an annual demand for print cartrides of 480 per year. The order cost is $15 per order, the carrying cost is 20 percent per cartridge per year of the purchase cost of $35 per cartridge. a) How many print cartirdges should the firm order at one time? b) What is the time between orders? Please explain in detail how you arrived at your solution.