Mather Company purchased equipment on January 1, 2016 at a total invoice cost of $336,000; additional costs of $6,000 for freight and $30,000 for installation were incurred. The equipment has an estimated salvage value of $12,000 and an estimated useful life of five years. The amount of accumulated depreciation at December 31, 2017 if the straight-line method of depreciation is used is: an Select one: a. $132,000. b. $148,800. c. $129,600. d. $144,000