The company acquired a machine on January 1 at an original cost of $70,000. The machine’s estimated residual value is $5,000, and its estimated lifetime output is 13,000 units. The actual output of the machine was as follows: Year 1, 3,000 units; Year 2, 5,000 units; Year 3, 2,000 units; Year 4, 3,000 units. Compute

(1) Depreciation expense for each year of the machine’s life and

(2) Book value at the end of each year of the machine’s life.