Each selling season the item is ordered. Orders are placed only once a season. No reordering happens during the season. Suppose the selling price of $25 and the item has no markdown value. If the cost of the item was $20, what order quantity should the store consider for the next time the item is ordered?

Also, I want to know salvage, mu, sigma, Cu, Co, critical ratio, z service factor, and Q

(Suppose an item has this demand history shown)

cost	20
retail	25				Demand History
salvage					36
					41
mu					32
sigma					60
					49
					52
Cu (retail-cost) (gain if have enough stock)					36
Co (cost-salvage) (loss if overstocked)					31
critical ratio (service level)(Cu/(Cu + Co))					47
					66
z service factor					24
					68
Q(optimal)					42