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Let the selling and cost prices be 'S' & 'C'. And 10S=11C implying (S-C)=C/10. Hence gain percent is  \frac{S-C}{C} (100) = 100/10= 10. Gain is 10%.
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thnxxx dear can u solve it in detail plzzz
Let the selling price is a and cost price is. 10A =11B So, A-B so, b/100 So, 100/10%=10%
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