title: C# Operator '*' cannot be applied to operands of type 'double' and 'decimal'
body: <p>A couple errors I am struggling to understand. I am attempting to make a sales tax calculator. But keep getting operation error because I cannot multiply a decimal by decimal. Here is my code for my calulate button:</p>
  
  <pre><code>decimal decTax;
  decimal decTotal;
  string input;
  decimal decOrder;
  // Accept the order from the Console window
  Console.Write("Enter order in dollars: $");
  input = Console.ReadLine();
  Decimal.TryParse(input, out decOrder);
  
  // Calculate the sales tax
  decTax = (0.06D  * (decOrder + decTax));
  decTotal = (decOrder + decTax);
  // Write the results to the Console Window
  Console.WriteLine();
  Console.WriteLine("The Total is " &amp; decTotal.ToString("c"));
  Console.ReadLine();
  </code></pre>