20. Mortenson Corporation sells its product, a rare metal, in a controlled market with a quoted price applicable to all quantities. The total cost of 5,000 pounds of the metal now held in inventory is $150,000. The total selling price is $420,000, and estimated costs of disposal are $15,000. At what amount should the inventory of 5,000 pounds be reported in the balance sheet? a. $135,000. b. $150,000. c. $405,000. d. $420,000