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Suppose the cost of 1 article be x.
So the cost of 10 articles=10x
Again cost of 9 article=9x
So profit=10x-9x=x
Now ℅ profit=x/9x×100=100/9=11 1/9℅
So the cost of 10 articles=10x
Again cost of 9 article=9x
So profit=10x-9x=x
Now ℅ profit=x/9x×100=100/9=11 1/9℅
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Cost of one article = a
Cost of 10articles = 10a = SP of 9 articles
SP of one article = 10a/9
profit = 10a/9 - a = (10a - 9a)/9 = a/9
profit percentage = (a/9)/a x 100 = 11.11%
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