To find the cost of each pen, we can start by writing an equation based on the information given. Amir bought a comic book for $9 and four pens, spending a total of $25.
Let \( p \) be the cost of each pen. The total cost can be expressed as:
\[ 9 + 4p = 25 \]
Now, we can solve this equation for \( p \):
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Subtract 9 from both sides: \[ 4p = 25 - 9 \] \[ 4p = 16 \]
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Divide both sides by 4: \[ p = \frac{16}{4} \] \[ p = 4 \]
Therefore, each pen costs $4.