title: unsupported operand type(s) for *: 'float' and 'Decimal'
body: <p>I'm just playing around learning classes functions etc, So I decided to create a simple function what should give me tax amount.</p>
  
  <p>this is my code so far.</p>
  
  <pre><code>class VAT_calculator:
      """
       A set of methods for VAT calculations.
      """
  
      def __init__(self, amount=None):
          self.amount = amount
          self.VAT = decimal.Decimal('0.095')
  
      def initialize(self):
          self.amount = 0
  
      def total_with_VAT(self):
          """
          Returns amount with VAT added.
          """
          if not self.amount:
              msg = u"Cannot add VAT if no amount is passed!'"
              raise ValidationError(msg)
  
          return (self.amount * self.VAT).quantize(self.amount, rounding=decimal.ROUND_UP)
  </code></pre>
  
  <p>My issue is I'm getting the following error:</p>
  
  <blockquote>
    <p>unsupported operand type(s) for *: 'float' and 'Decimal'**</p>
  </blockquote>
  
  <p>I don't see why this should not work!</p>