Hi, I'm a researcher in mathematical physics. What I will do is the following, provide solutions written in a PDF file using Latex (the professional editor) so that you have clear manual.
So, to make sure everything is done well, I'll solve them, then need time to type everything, then make sure there are no mistakes in the solutions or any typos. Hence I need a few days. And it's a nontrivial time-consuming task, hence the price.