Hawaiian Specialty Foods purchased equipment for $24,000. Residual value at the end of an estimated four-year service life is expected to be $2,400. The machine operated for 2,500 hours in the first year, and the company expects the machine to operate for a total of 15,000 hours.

Calculate depreciation expense for the first year using each of the following depreciation methods: (1) straight-line, (2) double-declining-balance, and (3) activity-based.