I don’t understand this Excel question and need help to study.

Hello, This assignment is related to Engineering economics. There are four questions.

Both questions three and four have a parts needed to be fully completed.

And there is a bonus question at the end for extra point I need it to be done.

Please read the written below carefully

You should submit your answers as a single PDF file. For Problem #1, please paste in any Excel tables that you use to produce your answers into your document so that they are in the single PDF file.

I will be uploading a file which includes everything on it, please read all the written instructions and the problems carefully.

This assignment worth and it should be perfectly done

Thank you.