6. (10 points) The circuit Town store sells a certain digital cameras XS520. The following data are estimated for this digital camera. Suppose that the store uses a periodic review system. Average daily demand = 200 units Standard deviation of daily demand = 30 Review period = 7days Lead time = 3 days To have a less than 3% stock out rate, a. (6 points) What is the order-up-to level? b. (2 points) If amount on hand at reorder time=10 units, what is the amount to order? c. (2 points) Describe your order policy in words