How do you find the amount required for the upcoming period?

and the amount needed until delivery + Safety factor?

Exercise 4.2 Barnaby's Hideaway uses the perpetual order method for its nonperishable foods. Given the following information, determine the reorder point and the reorder quantity for each of the following items. Add 50 percent to the amount you calculate as the amount needed until delivery as a safety factor when determining the reorder point. Canned Tomato Juice Normal usage, 2 cans per day Time to get delivery, 5 days Par stock, 24 Number of cans to a case, 6 Canned Peaches Normal usage, 3 cans per day Time to get delivery, 4 days Par stock, 36 Number of cans to a case, 12 Canned Black Olives Normal usage, 1 can per day Time to get delivery, 5 days Par stock, 12 Number of cans to a case, 12 Exercise 4.3 Assume that Barnaby's Hideaway will change its ordering system from a perpetual system to a periodic system, ordering nonperishables every two weeks. Given the following amounts of each found on the shelf, determine the amounts to order for each of the items in Exercise 4.2. Add 50 percent to the amounts calculated as a safety factor. Canned Tomato Juice, 10 cans Canned Peaches, 9 cans Canned Black Olives, 6 cans Exercise 4.3 Every Two weeks. Canned Tomatoes Amount required for upcoming period Amount on hand 28 10 18 Amount need until delivery + safety factor Amount to order 33 Canned Peaches Amount required for upcoming period Amount on hand 9 Amount need until delivery + safety factor Amount to order 55 Canned Black Olives Amount required for upcoming period Amount on hand 6