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See photo for solution and mark me as brainliest if i helped :)
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Answer: $16.66666667

Step-by-step explanation:

3= 5

6= 10

9= 15

10= 16.66666667

(the pens go up by 3 so you divide 5 by 3 to get the amount of 1 pen)= 1.66666667

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