If the cost price of 10 articles is equal to the selling price of 8 articles, then gain per cent is
Given , 10CP = 8SP .So, SP = $$\frac{10}{8}\times CP$$
Gain% = $$\frac{SP-CP}{CP}\times100$$
= $$\frac {\frac{10}{8}\times CP -CP }{CP}\times100$$
= 25%
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