An injection molding machine can be purchased and installed for $80000. It is in the seven-year GDS property class and is expected to be kept in service for eight years. It is believed that $10000 can be obtained when the machine is disposed of at the end of year eight. The net annual value added (i.e., revenues less expenses) that can be attributed to this machine is constant over eight years and amounts to $15000. An effective income tax rate of 40% is used by the company. What is the ATCF for this machine in year 4? Please only fill in the number of your calculated result in the blank, e.g., if the result is $100, fill in "100"; also round to the nearest integer.