A product sold in a retail store has an annual demand of 76,800 units. This product has been purchased by the store for R $ 10.00 / unit. The store works, on average, 300 days a year. Recently the new operations manager ran two simulations to try to find the economical lot for purchasing the product. In a first simulation he found a total cost of R $ 778,680.00, when he imagined a batch of 3,000 units per order. In a second attempt he found a total cost of R $ 777,840.00, when he estimated a batch of 6,000 units per order. Based on these data, he submitted the matter to his appreciation by asking whether the 3,000 unit lot was the economic lot. This product has a delivery time of 10 days and the store's operations manager has maintained a safety stock corresponding to 25% of the quantity corresponding to the economic purchase lot. On the other hand, two systems are also being studied to replenish the stock of this product: the fixed quantity system (continuous review system) and the periodic replacement system. Taking this information into account, define: The. The economic purchase lot and the respective total cost of this system. B. If the operations manager decides to adopt the fixed quantity replacement system: a. What will be the quantity that must be replenished each time? . What is the order point that will signal the need to process a new order? d. If, on the other hand, the manager decides to opt for the periodic replacement system, having decided to review the stock every 20 days. What will be the maximum theoretical stock expected? and. If the stock level at the time of the periodic review was 3,000 units and there were still 1,080 units ordered and not yet received, what is the quantity to be ordered?