During the last few years, there has been an enormous increase in the number of shops, stores and supermarkets which provide facilities for self-service. Their general purpose is to provide goods of every description attractively and hygienically and in perfect condition, so that the customer can serve herself, and then pay for the goods with the minimum of delay. In the passage, what does 'their' refer to?
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That text is not the most natural, Where did you find it?
— Teechr
That text is not the most natural, Where did you find it?
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The text is taken from a school textbook (grade 10) in a Southeast Asian country. However, I'd like to know what the word 'their' refer to according to this text.