A development of decision support system model for sale planning

Currently, to running a business is highly competitive. In marketing, seeking of information about customer needs is an important one. The sale planning is, to setting up strategies to conduct revenue from the sale of goods or services. The problems of sale planning may arise when there is changed in demands or price of goods. The proposed decision support system model for sale planning, is based on the Windows operating system which most of users are familiar. If users want to calculate the profit / loss on the change in sales price per unit and/or number of units sold of products, it can be done by entering the percentage of increase or decrease of the sales price per unit and/or number of units sold of products. The system displays the price per unit and number of units sold of products and the proceeds from the sale of all products less the total cost of the product. As a result, net profit / loss from the sale of all products. This is convenient for users, the system process rapidly, and accurately. For further study, if the system can forecast sales when changing the product price, or vice versa by finding the selling price that should be on specified of how much product sales.