Excel

kingcrimson 

Start by reviewing some existing discussions, and note how questions and answers are presented. That should explain how to ask a question.

In the case of homework problems, beware that usually we will not provide "turnkey" solutions.  You need to do the work yourself.

In that case, you might present the homework assignment verbatim (for our benefit), but  you should also present your attempts to solve the assignment yourself.

If you are completely lost, we can offer direction.  But it is better if you ask specific Excel questions ("how to calculate `25% more` of some value") instead of "how do I implement this assignment".

Ideally, attach an Excel file by clicking "browse" at the bottom of the reply window.  If the forum does not permit that, I can suggest other ways to provide the Excel file.

But at the very least, you  should provide a screenshot in one form or another.

Again, look at how other people have presented things in other discussions here.