Buying books

This task is about working out the cost of some books.
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Samantha wanted to buy some Beatrix Potter books.

Question 1Change answer

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a)  If each book cost $7.55, how much would a set of 7 Beatrix Potter books cost?
     $ 

Question 1Change answer

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b)  If each book cost $7.55, how much would a set of 5 books cost?
     $ 

Question 1Change answer

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c)  If a set of 9 books cost $65.25, how much does one book cost?
     $