How do barcodes connect to prices?

Correct answer: The store’s product database

The identifier is used to look up linked product information. A part of the number is not simply read as the price.

Evidence: A typical product barcode identifies the product; its price is usually retrieved from the store’s database. The key fact and first section separate the identifier from the retrieved information.

Correct answer: A product identifier that people can read

The scanner reads the bars and spaces, while people can check the product identifier in the digits below.

Evidence: Beneath a typical EAN or UPC product barcode, the digits show the same product identifier for people to read. The first section explains the machine-readable pattern and human-readable digits.

Correct answer: Special variable-measure or coupon systems can encode a price or value.

A rule about typical product-identification barcodes does not describe every system. The reading gives variable-measure goods and coupons as exceptions.

Evidence: Special systems for variable-measure goods or coupons can include a price or monetary value. The second section distinguishes the usual case from exceptions.