DuPage Company purchases a factory machine at a cost of $18,000 on January 1, 2014.
DuPage expects the machine to have a salvage value of $2,000 at the end of its 4-year useful life.
During its useful life, the machine is expected to be used 160,000 hours. Actual annual hourly use was 2014, 40,000; 2015, 60,000; 2016, 35,000; and 2017, 25,000.
Instructions 

Prepare depreciation schedules for the following methods:

(a) straight-line,

(b) units-of activity, and

(c) declining-balance using double the straight-line rate.