Chang Industries has 3,000 defective units of product that already cost $34 each to produce. A salvage company will purchase the defective units as is for $15 each. Chang's production manager reports that the defects can be corrected for $26 per unit, enabling them to be sold at their regular market price of $31. The $34 per unit is a: Multiple Choice Incremental cost Sunk cost Out-of pocket cost Opportunity cost