On January 1, 2017, Baker Corp. purchased a truck at a cost of $60,000. It has an estimated useful life of five years and estimated residual value of $10,000. On January 1, 2019 (the beginning of year three). Baker's managers concluded that the total useful life would be six years, rather than five and that there was no change in the estimated residual value. What is the amount of depreciation that Baker should record at December 31.2019 (end of year 3) under the straight-line method? A. $10,000 B. $ 8, 333 C. $7,000 D. $ 6, 667 E. $6,000 F. $7, 500