Mixed and Absolute Cell References. To avoid this problem created by the relative cell reference A7, mixed and absolute cell references can be used, which prevent all or part of a cell reference in a formula from changing as it is copied. Absolute and mixed cell references are created by adding dollar signs ($) to a cell reference. For example, in the image above, the cell reference $A$6 in the formula in cell B2 is an absolute cell reference and $A2 is a mixed cell reference.
The point of sale (POS) is the time and place where a retail transaction is completed. It is the point at which a customer makes a payment to the merchant in exchange for goods or after provision of a service.
Using a POS system makes a business much more efficient, lowering the costs of doing business while improving customer service and making the environment more pleasant to work in. In the retail trade, the âpoint of saleâ is the moment when a customer walks up to a counter with goods and prepares to purchase them.A POS system handles the transaction, whether it takes the form of an adding machine and a hand written receipt pad or a complex computer system.he most basic POS computer system is an electronic cash register. The clerk can ring up goods in the cash register and produce a receipt for the customer. At the end of the day, various cash register functions can be used to print out daily reports that are used to reconcile the cash register and to prepare a deposit.