Answer:
b. $480,000
Step-by-step explanation:
Calculation for the total relevant costs to make the part internally
Relevant cost per unit:
Direct materials $6
Direct labor 24
Variable manufacturing overhead 12
Fixed manufacturing overhead 6
[$15 ×(100%- 60%)]
Relevant manufacturing cost 48
(6+24+12+6)
Total relevant costs to make the part internally $480,000
($48 × 10,000)
Therefore the total relevant costs to make the part internally are: $480,000