Consider the following process, where 800 flow units enter the processevery day, and they go through a registration process in step 1. There is a buffer before entering step 2, and the average duration of waiting in that buffer is 15 minutes. At step 2, there is a assessment to specify where the flow unit must go next, and depending on the findings of that assessment, usually 70% of the flow units are directed to step 3 which takes half an hour in average, while the rest are directed to step 4 which takes 40 minutes in average. Once each flow unit goes through the respective step (3 or 4), they exit this process. Please answer the following questions accordingly. 3. Case A Start 1. Registration 2. Assessment End Wait 4. Case B Notes: 1) Condider each day as 8 hours. 2) Start and end points as well as decision points(assessment) have zero duration. 2-1.If 20 flow units are waiting to be registered or in the registation process (step 1) in average, how long step 1 takes? (4 points) 2-2.On average, how many flow units are waiting in the buffer? (4 points) 2-3. What is the process flow time? (4 points) 2-4.As you know, inventory can be calculated in 2 ways. Use both approaches to find the total inventory of the process. (4 points)