Answer and Explanation:
Here we choose between the making and buying decision
The making cost is
= Direct material per unit + direct labor per unit + variable manufacturing overhead per unit
= $4 + $4 + $3
= $11
And, the buying cost is $14.20
So Cruise company should make the part and save the $3.20 cost i.e. come from
= $14.20 - $11
= $3.20