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Answer:
A. $1.50
Explanation:
You can probably read the cost from the graph. Find the x-axis position corresponding to 1 pen and locate the point on the graph above that position. Then read the y-coordinate (cost) from the vertical axis. It will be sufficiently close to $1.50 that you can easily determine that to be the correct answer choice.
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Cost per pen is found by dividing cost by pens.
$4.50/(3 pens) = $1.50 /pen*
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* /pen would be pronounced, "per pen."