title: LINQ to SQL query Multiply two columns and calculate SUM
body: <p>Here's the SQL query</p>
  
  <pre><code>Select sum(f.Acres*m.credit1), sum(f.Acres*m.credit2), sum(f.Acres*m.credit3)
  from first f join model m on f.Id = m.fID
  where m.year == 2012
  </code></pre>
  
  <p>How to write this above SQL in LINQ?</p>
  
  <p>Thanks!</p>