I NEED HELP PLSS!!

1.) Two friends Ana and Juan are buying books by joining the History Book Club.
Ana has to pay a yearly fee of $15 to join. She spends a total of $525 for 30 books. How much was the price per book on average?
Juan has to pay a yearly fee of $10 to join. He spends a total of $350 for 23 books. How much was the price per book on average?
Write a function for Ana and Juan each to model the scenario to figure out the total cost per book. Who has the better deal? Ana or Juan? Why?​