Sample Override Code

Trying to go though some of the python coding on codeacademy.com
http://www.codecademy.com/courses/python-intermediate-en-WL8e4/2/4?curriculum_id=4f89dab3d788890003000096#

class Employee(object):
    """Models real-life employees!"""
    def __init__(self, employee_name):
        self.employee_name = employee_name

    def calculate_wage(self, hours):
        self.hours = hours
        return hours * 20.00

# Add your code below!
class PartTimeEmployee(Employee):
    def calculate_wage(self, hours):
        self.hours = hours
        return hours * 12.00
  
    def full_time_wage(self, hours): 
        return super(PartTimeEmployee, self).calculate_wage(10.00)
milton = PartTimeEmployee("milton")    

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When i try to see where the above code takes me, i get

"Oops, try again. milton.full_time_wage(0) returned 200.0 instead of the correct value: 0    " and I'm stuck.
How do i get to 200.00?