Key-Factor Analysis.

I do not know where you found the question called Metallica – it does not appear to be a past exam question. (If it is in the current edition of the BPP Revision Kit, then please tell. me the number of the question).

There is virtually always maximum demands for products in key factors questions. I explain how to do questions in my free lectures on key factor analysis, and there is maximum demands in the example that I work through.

This is a question from the BPP Revision Kit and I have found it. You must not post links to scans of questions because it is against copyright rules and therefore illegal for us to have it on our website. In future just tell me the number of the question and I will find it.
The scan you have posted means nothing at all without reference to the stem of the question that is written before the individual questions.

Limited factor analysis is both key factor analysis (if there is just one limiting factor) and linear programming (if there is more than one limiting factor). Here, there are five constraints – the demand for each of the products, the supply of each of the two materials, and the labour. It is therefore a linear programming problem (although you are obviously not required to solve it).

It seems that you have not watched my free lectures on linear programming, because there are demand constraints in the example that I work though.

Demand is a constraint because the maximum production of a product is limited by the number we are able to sell.

You are welcome.