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.

How to Calculate Profit Margin With Only Sales and Net Loss. A company's profit margin reveals how much of its earnings it gets to keep after it pays all of its expenses.

Calculating the total percentage gain or loss on a portfolio differs from analyzing the gains or loss on an individual stock.

Although each company is unique, calculating the profit and loss statement for a security guard company will follow the same basic formula as any other company.