 Okay, let's look at the example of non-instantaneous resupply. There is an industrial machine tool manufacturer. And this is supplied, annual demand is 750 units. Standard deviation of demand during lead time is 17.66 units. Machine setup costs are $50. Setup cost is called ordering cost is called carrying cost. Inventory carrying cost is 25% per year per part. And the part is valued at $35 each. So we have the holding cost is 0.25 multiplied by $35. Suppose that the production rate for these parts is 50 units per week. Now production rate is given in weekly term. Demand is given in annual term. Now we cannot use the formula P divided by P minus D formula. Because P is given in different weeks and demand years. So we cannot use P minus D. So we have to convert demand into weekly demand. So what does that mean? If we divide 750 units by 52, then we will get weekly demand. In lead time, 1 and a half weeks are included. Setup and production are both included. And in stock probability that the management wants is 95%. So the value of Z is 1.65. So we will use that from the table. Let's look at graphical terms. Same thing which is given in the problem with the statement. Let's look at it graphically. Basically this is the quantity which we have to do. This is demand rate and this is our production rate. Production rate is 50 units per week. Demand is 750 units per week. So we have to convert this into weeks. Which will be somewhere 14.42 units per week. This is the demand rate. This is basically the build up of the inventory. And this is our maximum inventory which will be built up. Production less demand. And this is our lead time which is 1.5 weeks. And what we need is to find out order quantity. What is the order quantity? What is the maximum inventory on this basis? And what is our reorder point? Which will drive this policy. When this reorder point reaches that level, we will place the order quantity for production. And then we will build up our inventory. And we will achieve maximum inventory.