How do I create an Excel spreadsheet that shows how to save taxes
 

How do I create an Excel spreadsheet that outlines how much I would save in
taxes by contributing to my 401(k) retirement plan if my income was $45,000
per year and I would provide the following investment choices: 1%, 2%, 3%,
3%, 4%, 5%, 6%, and 7% and I was in the 15% tax bracket?