7. On January 1, Crawford Company purchased for $90,000 a new machine that has an estimated useful life of ten years (or 550,000 stamping operations), after which the expected salvage value is $5,000. Under each of the following depreciation methods, calculate the depreciation expense for the year. a. Straight-line depreciation b. Double-declining balance depreciation c. Units-of-production depreciation, if 66,000 stamping operations were made in the year