An ostomy care provider uses barrier rings for the patients that it manages to prevent ostomy-related leaks. Last year, the provider used 6200 of the rings, each unit costs $50.94 and the annual carrying (holding) cost per unit is $10. It costs the provider $3.50 per unit to order the rings and lead time for delivery from an area supplier averages 5 days.

A. What is the EOQ for this item?

B. Determine the number of required orders per year based on EOQ.

C. When should the provider place an order for additional barrier rings if there is no requirement to keep safety stock?

D. How would the answers to A-C above change if demand is 10% higher than last year?