3. A retail store purchased a product from Distribuitor croatia for R$10.00 a unit and sells it for R$12.00. Last year 76,800 units were sold when the store operated for 300 days. Although the economic lot was fixed at 4,800 units, she bought the product in lots of 3,000 units. This replacement policy resulted in total annual costs of R$778,680.00. Typically, the distributor takes 10 days to deliver the product and, due to this time, the retailer has been keeping a responding safety stock that meets 89.25% of the average demand, whose standard deviation is 50 units per day. He is currently studying two stock replenishment systems: the fixed periodicity system and the continuous replenishment system. Taking this information into account, determine. The cost differential incurred by the store owner for not having adopted a lot-based replacement economic? If the merchant decides to adopt the continuous replenishment system, what will be the level of stock that will signal the need for a new order? And what quantity to order? If the merchant adopts a periodic replacement system every 20 days, what will be the quantity to be ordered if the stock reaches 3,000 units and the distributor still has to deliver 1,080 units from a previous order?