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To find out how much 9 candy bars cost, we can set up a proportion using the given information.
Let's assume that the cost of 9 candy bars is x dollars.
Now, we can set up the proportion:
6/4.50 = 9/x
Cross-multiplying gives:
6x = 9 * 4.50
6x = 40.50
Dividing both sides of the equation by 6 gives:
x = 40.50 / 6
x ≈ $6.75
Therefore, 9 candy bars cost approximately $6.75. Answer: $6.75