this is added to my previous question
assume that the only service performed is the giving of haircuts, the unit price of which is $12
see my previous post.
Apologies, but I'm unable to refer to your previous post as I only have access to the current conversation. However, based on the information you provided, it seems you are referring to a question about a service that involves giving haircuts at a unit price of $12.
If you have any specific question or need guidance on something related to this topic, please feel free to ask, and I'll do my best to assist you.