Mather Company purchased equipment on January 1, 2016 at a total invoice cost of $560,000; additional costs of $10,000 for freight and $50,000 for installation were incurred. The equipment has an estimated residual value of $20,000 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 Select one a. $124.000 b. $240,000 c. $220,000 o d. $216,000