Total amount of money saved by Bella = $39
Let x represents the number of books bought by Bella be x
x = 3 books
Cost of each book = $13
Total amount of money saved by Bella = (Cost of each book) x (Number of books)
Total amount of money saved by Bella = 13x
Since x = 3
Total amount of money saved by Bella = 13(3)
Total amount of money saved by Bella = $39
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