Final answer:
The total variable cost of sandwiches sold last month can be obtained from the cost information given for the specific quantity sold, similar to how costs are calculated for a competitive firm like Doggies Paradise Inc.
Step-by-step explanation:
To calculate the total variable costs of sandwiches sold last month, we could use the principles of a perfectly competitive firm, similar to the dog coat example provided by Doggies Paradise Inc. Assuming we have data on the variable costs for different quantities of sandwiches like we do for the dog coats, we could simply look at the cost mentioned for the total quantity sold last month.
For instance, if the total variable cost for producing three units is given as $114, and the firm sold three units (sandwiches) last month, then the total variable cost of sandwiches sold would be $114. If more information is given, such as the price per sandwich and the quantity sold, we could construct a table to show various cost metrics and profits at different levels of output.