clear answer asap please!

A print shop, open 5 days per week, 50 weeks per year, uses an average of 100 packs of 842 x 11 paper each week. Demand follows a normal distribution with a standard deviation of 3 packs per day. The paper supplier can deliver in one week (5 working days). The print shop wishes to maintain a stock-out risk of no more than 2%. The purchasing cost of a pack of paper is $5. The annual holding costs represent 10% of purchasing costs and the order cost is equal to $20. Packs are shipped in boxes of 10. ---What quantity will be ordered each time? --How many orders will be placed in one year? ---What will be the total annual costs? --- Propose a simple way of monitoring the level of inventory. How could we tell when it is time to reorder