Rsa Government Jobs Exams Numerical Ability

The cp of 21 articles is equal to sp of 18 articles.find gain or loss %

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50/3 % gain

If CP of an article=x, then CP of 18 article=18x and CP of 21 article=21x=SP of 18 article
So gain %=(21x-18x)*100/18x= 50/3 or 16 2/3
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