Please include formulas and work towards the answer. The questions are not asking for the definitions but rather the answer using the data provided. Thank you

Inventory Management: 30 points total Include all steps that get you to the answer. If it is difficult to show the formulas in word document, you can hand write it up and paste the image in the word document. The annual demand for a specific brand of phone is 15,600 units. Weekly demand is 300 units with a standard deviation of 90 units. The cost to place an order is $31.20 and the time from ordering to receipt is four weeks. The annual inventory carrying cost is $0.10 per unit. a. How many phones should be ordered when the manager places an order? (10 points) b. Find the reorder point necessary to provide a 98% service level. (10 points) c. What is the safety stock? ( 5 points) d. What is the inventory policy? (5 points)