On July 1, 2016, Idaho Systems Company purchased for $54,000 a new machine that has an estimated useful life of six years (or 300,000 cutting operations), after which the expected salvage value is $3,600. Under each of the following depreciation methods, calculate the depreciation expense for 2017. Required: a. Straight-line depreciation b. Double declining-balance depreciation c. Units-of-production depreciation, if 55,000 cutting operations were made in 2017