One of the authors of your textbook, Dr. Timothy Mayes at Clemson, has outstanding personal webpage with a huge variety of tutorials, tips, and add-ins for Excel. See it at clem.mscd.edu/~mayest/Welcome.html. You will also find a great set of tutorials on using financial calcualators or all sorts.
Microsoft has many good resources on its Excel website, including tutorials, templates, and much more. office.microsoft.com/en-us/excel/
Lynda.com is a fee-based repository of professional video tutorials on just about every software system in existence. The Excel tutorials here are excellent.
Excel2007.tips.net has lots of good free tips and tutorials on using Excel.
About.com has a good repository of tips and tricks at this link.
A web search will turn up many other resources.
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