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<pre>
DataFrame <code>employees</code>
+-------------+--------+
| Column Name | Type |
+-------------+--------+
| name | object |
| salary | int |
+-------------+--------+
</pre>
<p>A company intends to give its employees a pay rise.</p>
<p>Write a solution to <strong>modify</strong> the <code>salary</code> column by multiplying each salary by 2.</p>
<p>The result format is in the following example.</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:
</strong>DataFrame employees
+---------+--------+
| name | salary |
+---------+--------+
| Jack | 19666 |
| Piper | 74754 |
| Mia | 62509 |
| Ulysses | 54866 |
+---------+--------+
<strong>Output:
</strong>+---------+--------+
| name | salary |
+---------+--------+
| Jack | 39332 |
| Piper | 149508 |
| Mia | 125018 |
| Ulysses | 109732 |
+---------+--------+
<strong>Explanation:
</strong>Every salary has been doubled.</pre>