Alpha Snacks (AS) uses a periodic review inventory policy in ordering chocolate-multi-grain snack bars. The vendor visits the store every three weeks to take orders[ lead time for shipments is three days. The daily demand of the snack bars is normally distributed with a mean of 50 and a standard deviation of 10. The vendor is due to visit the store to-day and AS has to prepare order for their next shipment. Currently, there are 180 of these snack bars in stock, how many snack bars should AS order. AS has a service policy of 99%