title: Change placeholder of input when I select Option
body: <p>I have been trying out some jQuery coding but doesn't seem to work. In the <code>#vat</code> input, I need the placeholder to change. </p>
  
  <pre><code>    &lt;select id="VatExpense"&gt;
          &lt;option value="" disabled selected&gt;&lt;/option&gt;
          &lt;option value="0"&gt;&lt;/option&gt;
          &lt;option value="1"&gt;&lt;/option&gt;
          &lt;option value="0"&gt;&lt;/option&gt;
          &lt;option value="0"&gt;&lt;/option&gt;
          &lt;option value="1"&gt;&lt;/option&gt;
      &lt;/select&gt;
  
     &lt;input type="text" id="vat" placeholder="Rate"&gt;
  </code></pre>