Answer and Explanation:
The computation is shown below:
The relevant costs for Xia Co. to make or buy the part is Â
Direct materials     $2.25
Direct labor          1.00
Incremental overhead 0.75
Total relevant cost  $4.00
And, the relevant cost of buying a component is $5
So here the less cost would  be considered
Therefore the component should make as it saves $1 per unit
The same would be considered and relevant too