def high_income_amount(responses, derived):
    """ Return the guidelines table amount for a high income earner """

    try:
        under = float(responses.get('child_support_amount_under_high_income', 0))
    except ValueError:
        under = 0

    try:
        over = float(responses.get('amount_income_over_high_income_limit', 0))
    except ValueError:
        over = 0

    return under + over