3650.11 – Peanut Butter Pricing
If a glass jar of all natural peanut butter 3 inches in diameter and 4 inches tall sells for $2.00, what is a fair price for one that is 6 inches in diameter and 6 inches tall?
Pricing ought to be by the volume of peanut butter inside. The volume of a cylinder of radius and height is . For the two cans in the problem we have volumes of
respectively. In case the answer isn't jumping right off the page, we use a proportion,
Question to ponder: The solution begins with the statement that the cost should depend on the volume inside the jar. But shouldn't the amount of material in the jar itself--the glass or plastic--be taken into account somehow too?