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