private double amountFor(Rental aRental) {

        double result = 0;

        //determine amounts for each line
        switch (aRental.getMovie().getPriceCode()) {
            case Movie.REGULAR:
                 result += 2;
                 if (aRental.getDaysRented() > 2)
                     result += (aRental.getDaysRented() - 2) * 1.5;
                 break;
            case Movie.NEW_RELEASE:
                 result += aRental.getDaysRented() * 3;
                 break;
            case Movie.CHILDRENS:
                 result += 1.5;
                 if (aRental.getDaysRented() > 3)
                     result += (aRental.getDaysRented() - 3) * 1.5;
                 break;

        }
        return result;
   }