title: Excel - Insert formula in empty cell
body: <p>I want to insert a value on empty cell and this value multiplies automatically by 2.</p>
  
  <p>Is it possible?</p>
  
  <p>For example:</p>
  
  <p>I set the cell value = 2. When I hit enter, it should change to 4 automatically.</p>
  
  <p>How can I do this?</p>