[flexcoders] Stupid question: Adding dollars

[Wally Kolcz]

I must be having a moron-moment. I have dollar amounts in the database (45.32, 
34.23, 50.25) and I want to look them and assign them to a Number variable. But 
it keeps coming up as NaN or empty. What am I missing here?

[Bindable] public var medTotal:Number = 0;

public function calculateTotal(e:ArrayCollection):void {
            for(var i:int = 0; i < e.length; i++){
                medTotal += e.getItemAt(i).cost;
            }
        }