Final answer:
The relevant costs to Golden of manufacturing the parts internally are the avoidable costs, including direct materials, direct labor, and variable manufacturing overhead. The fixed manufacturing overhead is not avoidable. The total relevant cost would be $70,000.
Step-by-step explanation:
When determining whether to accept Brown's offer, the relevant costs to Golden of manufacturing the parts internally are the avoidable costs. In this case, the avoidable costs are the direct materials, direct labor, and variable manufacturing overhead, since Golden can purchase the parts from Brown. The fixed manufacturing overhead is not avoidable, as two-thirds of it will continue even if the parts are purchased from Brown. Therefore, the relevant costs to Golden of manufacturing the parts internally would be:
- Direct materials: $2/unit x 5,000 units = $10,000
- Direct labor: $8/unit x 5,000 units = $40,000
- Variable manufacturing overhead: $4/unit x 5,000 units = $20,000
This would result in a total relevant cost of $70,000 for manufacturing the parts internally.