title: Adding a dollar sign in front of currency
body: <pre><code>select ( (select price from fruit where name = "apple") * sum( quantity )))
  as "value of apples" from inventory
  where fruitID = (select fruitID from fruit where name = "apple");
  </code></pre>
  
  <p>The output gives me the value of apples but without the $ in front of it. I know I need to add the concat function somewhere but I cannot figure out where it goes. </p>
  
  <p>Where do I add <code>(concat("$", )</code> ?</p>