The most important financial statements for any business are the profit and loss account, which lets you know the areas where you are most and least effective. To work this out you need to calculate capital gain against loss. Capital gain can be calculated at any time but it is not realized until the asset is sold. It is a profit that results from the sale of an asset, whether it is stocks, bonds or real estate. The difference between sale price and original price is the capital gain, normally used for tax purposes. To work it out the loss or gain you have to determine the original cost, the amount originally paid for the asset and then determine the sale price of the asset, final amount received in exchange for the asset. Then subtract the original cost from the sale price. Make sure you decide what time frame you will be reviewing - it could be monthly, quarterly or over a full year so that you have a record of your sales. You need to write down all of the sales areas your business encompasses and then write down the budget you give to each division within the specified time period. Record the sales figures you need to reach in order to clear a profit. Record the sales and gather the sales report for each division, and write down their respective totals brought in. Take the amount earned by each division and subtract from the amount spent. Finally add the spending figure for each division, and then add all the actual sales and by subtract the higher number from the lower one, you will be able to determine the overall profit or loss for a business. A useful tool for calculating profit and loss in business is the QuickBooks accounting system.

In simplest terms: Revenues - Costs = Net Income or Net Loss

You only did about 20% of the business you did last year, than means an 80% loss.