def lost_work_hours_total(tracker_data, wfh_prod=0.51):
    """
        Adds up lost work hours from all sources (kid, ill, quarantine).
        Sums across age bins 25 to 64.
        The simulator assumes full employment among agents aged 25 to 64.

        Attrs:
            - tracker_data: loaded tracker data file
            - wfh_prod: productivity of agents forced to work from home.
        Returns:
            - float for total lost work hours across all agents aged 25 to 64
    """

    lost_work_hours = (tracker_data['work_hours']['WORK-CANCEL--KID'][5:13] +
                       tracker_data['work_hours']['WORK-CANCEL--ILL'][5:13] +
                       tracker_data['work_hours'][
                           'WORK-CANCEL--QUARANTINE'][5:13] * (1-wfh_prod)
                       )

    return lost_work_hours.sum()