Chang Industries has 1.100 defective units of product that already cost $52 each to produce. A salvage company will purchase the defective units as is for $24 each. Chang's production manager reports that the defects can be corrected for $44 per unit, enabling them to be sold at their regular market price of $40. The $52 per unit is a: Multiple Choice Sunk cost. Period cost. Sunk cost. Period cost. Opportunity cost. Incremental cost. Out-of-pocket cost