Answer:
a. If Mel decides to sell dinners, what are the total costs for both making and buying the cookies?
if Mel decides to sell dinners, the he will not have any spare capacity for producing cookies, so the production costs would be different:
direct materials $0.20
direct labor $0.15
total overhead (including variable and fixed) $0.45
total cost per cookie = $0.80
Purchase price form external supplier = $0.60 per cookie (same as before).
b. Should Mel continue to buy the cookies? Yes No
It would be better for Mel to simply buy the cookies from an external supplier at $0.60.
Mel should only produce the cookies if he decides not to sell dinners.