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Self-service store is a concept in trade, in which the purchase of goods and services is made by the buyer independently, without the help of service personnel.
Cashier - cash of an enterprise or organization; a division of an enterprise that carries out cash transactions; as well as the room where such a unit is located.
The purchase price is the amount of money in exchange for which the seller is willing to transfer (sell) a unit of goods.
Seller is a profession, specialty, person or organization that sells something.
Cashier - an employee who accepts, stores and records cash.
Change is the surplus money returned to the buyer upon settlement.

Windsor Iies twenty-one miles from London. If you  go there by train, it  will take  you an hour. Windsor is famous for its ancient castle and beautiful countryside. For 800 years Windsor Castle has been the residence of the British Royal Family. The Castle was  started by William the Conqueror in the 11th century. The surrounding countryside has changed little since the time when Chaucer stood there looking at the country beneath. The most important feature of the Castle  is the Round Tower which can be seen from far away.