A shopkeeper buys a pen set of 10 pens in 95 rupees and sell them at a rate of 10 rupee per pen. If every set contains an additional pen of same quality then what is the percentage profit obtained by the shopkeeper?

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A shopkeeper buys a pen set of 10 pens in 95 rupees and sell them at a rate of 10 rupee per pen. If every set contains an additional pen of same quality then what is the percentage profit obtained by the shopkeeper?

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