def payor_section_seven_expenses(responses, derived):
    """ Return the monthly cost of section 7 expense for the identified payor """

    if derived['child_support_payor'] == 'Claimant 1':
        return derived['claimant_1_share']
    elif derived['child_support_payor'] == 'Claimant 2':
        return derived['claimant_2_share']
    return derived['total_section_seven_expenses']