Percentages aren't always easy to calculate, but one of the best tools in Excel's toolbox is calculating percentages for you. Here's how to do it.

Profit margins vary by industry and should only be compared to those of similar companies. You can use computer software, such as Microsoft Excel, to quickly calculate profit margins.

The payback period is the amount of time needed to recover the initial outlay for an investment. Learn how to calculate it with Microsoft Excel.