ActionScript 3.0 :: Multiplying Numbers With Decimal Points?

I have a function that adds the values of an array together and displays the output in a textArea(myText).
 
The code below works fine, but the output number is "11.5" I need this to be "11.50" and again if we set the array index [1] to "0" instead of ".50" I would need to show "11.00" instead of "11" which is what I am getting now!
 
var myArray:Array = new Array(1.50,.50,0,9.50); function addValues(myArray:Array):Number{ var arraySum:Number = 0; for (var i:uint=0; i< myArray.length; i++){      arraySum += myArray[i]; } return arraySum } trace(addValues(myArray)); myText.text = String (addValues(myArray));