Q$4$: Peter Inc. currently makes the R$18$ component. They incurred the following costs to make $10,000$ units last month, direct materials $$24,$ direct labour $$16,$ variable overhead $$8,$ and fixed overhead of $$2.$ R$18$ can be purchased externally for $$48.$ Should Peter Inc. make or buy the R$18?$

A$)$ Make the R$18$ and save $$10$ per unit

B$)$ Make the R$18$ and save $$2$ per unit

C$)$ Buy the R$18$ and save $$2$ per unit

D$)$ Either decision nets the same result