If the selling price of 10 articles is equal to the cost price of 11 articles, then the gain percent is
If the selling price of 10 articles is equal to the cost price of 11 articles, then 10SP = 11CP i.e. SP = $$\frac{10}{11}\times CP$$
gain% = $$\frac{SP - CP}{CP}\times100$$
= $$\frac{\frac{10}{11} CP - CP}{CP}\times100$$
= 10%
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