Answer :
Answer: $0.30 per dozen.
Step-by-step 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 = [tex]\dfrac{1}{3}\times\text{whole cost}[/tex] [given]
[tex]=\dfrac{1}{3}\times9=\$3[/tex]
Then, the selling price of each dozen = [tex]\dfrac{\$3}{10}=\$0.30[/tex]
Hence, the shopkeeper sells the remaining pencils at $0.30 per dozen.