If the cost price of 10 articles equals selling price of 9 articles, the gain or loss percent will be
Let C.P. of 1 article = 1
=> C.P. of 10 articles = 10*1 = 10
which is equal to S.P. of 9
=> S.P. of 1 item = $$\frac{10}{9}$$
=> profit % = $$\frac{\frac{10}{9}-1}{1}$$ * 100
= $$\frac{100}{9}$$ = 11$$\frac{1}{9}$$%
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