title: NaN in multiplication
body: <p>I am trying this code, but i am getting NaN</p>
  
  <pre><code>a = unidade.val();
  b = unitario.val();
  //alert(a);5
  //alert(b);50,00
  $(total).val(a * b); //NaN
  </code></pre>
  
  <p>Why? because is a <code>int*float</code>?</p>