Answer:
$1.45 for one pack of pens
Step-by-step explanation:
First, you need to know how much he paid for ALL 5 packs:
10.00 - 2.75 = 7.25
Now, assuming all packs of pens are the same price, you divide 7.25 by the 5 packs of pens:
7.25 / 5 = 1.45
each pack of pens costs $1.45
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