The correct option is A 11.11%
Given that,
The cost price of 10 articles is equal to the selling price of 9 articles.
Let the cost price of one article be ₹ x and the selling price of one article be ₹ y.
∴10x=9y
x=9y10
Hence, selling price is more than cost price.
So, there will be profit.
Profit = S.P - C.P
=₹(y−9y10)
=₹y10
Profit % =ProfitC.P×100
=y109y10× 100
=19×100
=11.11%
Hence, the profit percentage is 11.11%.