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The question is actually not very clear and it comes under math category.
if a teacher wants to teach a student about purchasing methods, the pupil may be taken to a nearby store and taught the basics of shopping with sense like looking into the cost, manufacture date and expiry date and then making the actual purchase
had the question been clearer a better answer could have been given
i Guess this question is How to teach purchasing method from any shop? i dont think so any methods exist. for purchase keep in mind the quality and price.. 
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