Answer: $0.30 per dozen.
Explanation:
Given: The whole cost of 13 dozen pencils = $9
If 3 dozen broke in transit, remaining dozens of pencils = 13-3 = 10 dozens
Also, Selling price of theses 10 dozens =
[given]
![=(1)/(3)*9=\$3](https://img.qammunity.org/2021/formulas/mathematics/college/jzjdashdxvo5b4m4qf2lo274y6yrbxssxg.png)
Then, the selling price of each dozen =
![(\$3)/(10)=\$0.30](https://img.qammunity.org/2021/formulas/mathematics/college/i1gw53hsj135g9ni43kch0daarx7nmv5cl.png)
Hence, the shopkeeper sells the remaining pencils at $0.30 per dozen.