If cost price of 11 articles is 10 rupees and selling price of 10 articles is 11 rupees what is the gain%.?
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cost of one article =10/11
cost of 10 article s=10*10/11
=100/11
proft. =11-100/11
=121-100/11
=21/11
%. ={21/11}/{10/11}*100
cost of 10 article s=10*10/11
=100/11
proft. =11-100/11
=121-100/11
=21/11
%. ={21/11}/{10/11}*100
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