Answer:
$9,000
Explanation:
Total variable cost of manufacturing the components are as follows;
Direct materials $21,000
Direct labor 6,000
Variable overhead 3,000
————
Total $30,000
If we purchase the cost is $39,000 and the company is indifferent if they will manufacture or purchase. Therefore;
$39,000 - 30,000 = $9,000 (unavoidable fixed cost)