Amazon Company purchased equipment on January 1, 2016, at a total cost of $400,000. The equipment has an estimated salvage value of $10,000 and an estimated useful life of 5 years. If the straight-line method of depreciation is used, the amount of accumulated depreciation at December 31, 2017, is Select one: a. $ 160,000 b. $ 80,000 c. $ 156,000 d. $ 78,000