Spencer Company purchased a tractor at a cost of $360,000 on January 1, 2019. The tractor has an estimated salvage value of $60,000 and an estimated life of 8 years. If Kate uses the straight-line method, what is the book value at January 1, 2023? Select one: o A. $70,000 o B. $50,000 O C. $82,500 o D. None of the above