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## Answers

So cost price of 1 pen =Rs.

It is sold at 9 for a rupee

So selling price of 9 pens = Re. 1

So selling price of 1 pen =Rs.

gain =

gain % =

**%**

**Gain is 33.33%.**

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So cost price of 1 pen =Rs.

It is sold at 9 for a rupee

So selling price of 9 pens = Re. 1

So selling price of 1 pen =Rs.

gain =

gain % =