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# A stationer sold 1 dozen of pens at the rate Of Rs 25 each and gained Rs 120 altogether. How much was the cost price of the pens.

**Given: ** A stationer sold 1 dozen of pens at the rate of Rs 25, each and gained Rs 120 altogether.

**To do:** Find the CP Of the Pens.

**Solution:**

Total selling price = $25\times12 = Rs.300$

Total profit = $120$

Total profit = Total selling price $-$ Total cost price

$120 = 300 - $ Total cost price

=> Total cost price = $300 -120 = Rs 180$

Cost of 12 pens = $180$

=> Cost of 1 pen = $\frac{180}{12}$

**Therefore, the CP of the pens are Rs 15**

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