।,॥।।।। if we look at basically this model, this is our receive orders, this is our inventory depletion and this is the average inventory that we are maintaining. Plus this one is your safety stock which we maintain throughout the year. This is an assumption that in the ideal conditions, this will be with us throughout the year. So what does that mean? That means that Q is consuming and then it is adding and then it is consuming and then it is adding and then it is consuming. If it reaches zero, then the new quantity and the inventory is built up. So that is why we have calculated Q divided by 2 as per the average inventory. But we are maintaining this safety stock throughout the year. So this will not be divided by 2. This will be added in your average inventory. So basically what you will get is that again this is the same thing that the beginning inventory plus the ending inventory is divided by 2. In this case, the beginning inventory is Q plus the safety stock and the ending inventory is just the safety stock because Q is zero. So if you sum this up, then what will it become? Q plus the beginning inventory plus the safety stock is the ending inventory divided by 2 which gives you Q divided by 2 plus the safety stock. So this is basically your average inventory. So you should never divide this by mistake the safety stock from 2 because the safety stock is in ideal condition. We have the assumption that throughout the year it will be divided and then we will keep incurring the inventory holding cost throughout the year. So this is why this average inventory will be included.