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Which is not necessary when using bar codes in supermarkets

This question belongs to Computer Fundamentals Computer Fundamental Miscellaneous
Computer Fundamental Miscellaneous
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Which is not necessary when using bar codes in supermarkets?

Answer & Solution
Correct Answer: Option C
Price on the shelf is not necessary when using bar codes in supermarkets. It also contains a check digit, so that the computer can validate that the data has been read in correctly. The barcode does not contain price. The price is held in the database instead. This makes it easy to change if there are special offers or prices go up.
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