Answer
The answer and procedures of the exercise are attached in the following archives.
Explanation
The company should buy the product.
Notes:
1. Variable cost will not be incurred in buy option as variable cost is directly linked to production quantity. In cade of no production, this will be zero.
You will find the procedures, formulas or necessary explanations in the archive attached below. If you have any question ask and I will aclare your doubts kindly.