U.S. Airfilter has hired you as a supply chain consultant.

The company makes air filters for heating and air conditioning.

The filters are being made at a factory in Louisville, Kentucky, United States,

It is distributed to retailers through 100 wholesalers in the United States, Canada, and Europe. The following is data related to the inventory value on the company's supply chain.

(in millions of dollars)

	Q1	Q2	Q3	Q4
Sales volume:
US	300	350	405	375
Canada	75	60	75	70
Europe	30	33	20	15
Cost of goods sold:	280	295	340	350
Raw Materials	50	40	55	60
Work in process & finished goods inventory	100	105	120	150
Distribution center inventory :
US	25	27	23	30
Canada	10	11	15	16
Europe	5	4	5	5

a. What is the average inventory turnover for this company?

b. What should I focus on to increase inventory turnover? What's the matter?

c. The company reportedly used $500 million worth of raw materials for a year.

What is the number of weeks of stock supply for raw materials in the factory?