ABC Inc purchased a machine on January 1, 2015, for $111,433. At the time of purchase, the machine was estimated to have a life of seven years and a residual value of $37,750. The company uses the sum-of-the-years'-digits method of depreciation. How much depreciation expense should the company claim for year 2017? Select one: a. None of these b. $13,157.68 c. $15,789.21 d. $18,420.75