A company keeps 60 days of materials inventory on hand to avoid shutdowns due to materials shortages. Carrying costs average $5,000 per day. A competitor keeps 30 days of inventory on hand, and the competitor's carrying costs average $2,000 per day. The non-value-added costs for the company are (Points : 5)

a. $300,000. b. $150,000. c. $60,000. d. $0.