Jonathan Jingles is a wholesale distributor of videotapes. He sells approximately 9,000 tapes every year. He estimates that it costs $0.25 per tape to carry inventory for 12 months and it costs $15 each time he orders tapes from the factory.
a. How many tapes should he order to minimize costs?
b. Based on the order size computed in part (a), how many orders will he need to place each year?
c. Based on your answer to part (b), at what time interval will Jonathan be placing orders for videotapes?