Joe's Camera shop has a favorite model that has annual sales of 160. The cost to place an order to replenish inventory is $24 per order, and annual inventory carrying costs are $20. Assume the store is open 320 days per year. a. What is the optimal order size? b. What is the optimal number of orders per year? c. What is the optimal number of days between orders? d. What is the average inventory? d. What is the annual inventory carrying cost? e. What is the annual inventory ordering cost? f. What is the annual total inventory cost?