This math activity walks students through the process of how firms determine the economics of one unit. However, this usually turns out to be one of the more "interesting" activities for students, because it involves something they love--brownies. Note: If you love the activity, I have three other "products" that I can email you for free in exchange for some happy reviews!
Here's the intro:
"The owner of a local bakery, Tasty Treats, in Brooklyn, New York has asked your consulting firm to help launch a new product, Breezy Brownies.
You and your group must do some shopping—and the math—to determine all the necessary figures to make this a profitable product for the Tasty Treats bakery. In addition, you will need to do some market research and develop a marketing plan to make sure that the new product is in demand and economically successful."
This was designed for an introductory unit for a 12th grade Economics course, but it can certainly be adopted for a variety of courses and needs. Might be great for a home economics course.