Final answer:
After calculating the rebate from movie tickets, we subtracted that amount from the total monthly rebate to find the amount earned from books. Dividing this amount by the rebate per book gave us the number of books bought, which is 8 books. Option C) 8 books is the correct answer.
Step-by-step explanation:
To determine how many books Molly bought last month, we first calculate the total rebate she earned from movie tickets. Since she earns $0.25 for each movie ticket and purchased 4 tickets, she earned 4 × $0.25 = $1 from the movie tickets.
Next, we subtract the rebate earned from movie tickets from the total rebate of $17 to find the rebate earned from books: $17 - $1 = $16. Molly earns $2 for each book, so we divide the rebate earned from books by the rebate per book: $16 × 1 book / $2 = 8 books.
Therefore, the correct answer is C) 8 books, which is the number of books Molly bought last month.