Maximization of Volume of Sale of a firm

Have you ever studied differential calculus? We had a course in college, but that was over 50 years ago. It's a good skill to learn when trying to figure out the best option on known fixed costs such as labor, storage, advertising, and other associated costs.

Differential calculus - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Differential_calculus
In mathematics, differential calculus is a subfield of calculus concerned with the study of the rates at which quantities change.

cicerone imposter,
I have a fair knowledge of calculus (Diff/Int). But, the basic prob for me is to conceptualize Marco economics that I have never studied before.

If you know what all of your fixed costs are including overhead, you should be able to determine minimum and maximum sales price to find out the demand for the product at any given price.
Most cost of goods sold hovers around 50%.
If you understand standard cost, you'll be able to determine where to price the product. As a consultant, I have established standard cost systems for several retail businesses. It makes it easy to determine gross profit and to take inventory.