The Carter Corporation makes products A and B in a joint process from a single input, R. During a typical production run, 50,000 units of R yield 20,000 units of A and 30,000 units of B at the split-off point. Joint production costs total $90,000 per production run. The unit selling price for A is $4.00 and for B is $3.80 at the split-off point. However, B can be processed further at a total cost of $60,000 and then sold for $7.00 per unit. In a decision between selling B at the split-off point or processing B further, which of the following items is not relevant:a. $10,000) per production run b. $96,000 per production run c. ($42,000) per production run d. $36,000 per production run

As we are dealing with the decision of whether or not to process the good further, the irrelevant cost would be the cost of producing product B from input R.

This is because this cost has already been incurred to produce product B and so is a sunk cost. Sunk costs are irrelevant to the decision to process further.

30,000 units of B were made from 90,000 units R so the cost of B is:

= 30,000 / 50,000 * 90,000

= $54,000

The options here are probably for a variant of this question.