The cp of 21 article is equal to sp of 18 articles.find the gain or loss percentage
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lets us take cost price of each article be x then cp of 21 articles is 21x he sells 18 articles for 21x ruppees so per article sp= 7/6(x) so profit%=7/6x-xdivided by x × 100 which is 16.67%
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