5,000 is the correct answer, the net benefit of selling the reworked units.
Scrap value (15,000*6) = 90,000
Net proceeds from sale of reworked units (15,000*9) - 40,000 = 95,000
Net benefit of selling the reworked units 5,000
An unrecoverable expense that has already been made is referred to as a sunk cost. Sunk costs, for instance, might include the price of machinery and equipment as well as the cost of the factory's lease for a manufacturing company. Sunk costs are not considered in a sell-or-process-further decision, which is a decision.
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