A heavy construction firm has been awarded a contract to build a large concrete dam. It is expected that a total of 8 years will be required to complete the work. The firm will buy $600,000 worth of special equipment for the job. During the preparation of the job cost estimate, the following utilization schedule was computed for the special equipment:

                      Utilization                                           Utilization

Year                (hr/yr)              Year                            (hr/yr)

1                      6000                5                                  800

2                      4000                6                                  800

3                      4000                 7                                 2200

4                      1600                8                                  2200

At the end of the job, it is estimated that the equipment can be sold at auction for $60,000.

(a) Compute the sum-of-years-digits' depreciation schedule.

(b) Compute the unit-of-production depreciation schedule.