Topic summary
Shop receipts

Extracted from the Wikipedia article Receipt.
Shop receipts
The practice in most shops at the point of sale is for a salesperson to scan or record the price of a customer's proposed purchases, including tax, discounts, credits, and other adjustments. In traditional situations and still in some family businesses today, the salesperson would then show the customer the summary, the invoice, for their agreement; but many shops today bypass this stage. The practice of presenting an invoice is most common in restaurants where a "bill" is presented after a meal.