Answer:
The correct answer is : " c. $30 Manufacturing cost".
Explanation:
According to the scenario given above, $30 which is the manufacturing cost is not relevant to the sell-or-rework decision as the company may suffer a loss on the sale of goods.
Reworking on the defective units for $30 will lead to a manufacturing of $30 (previous manufacturing cost) plus reworking cost (current $30) which is total of $60. Thus, it seems to be a loss.