A contractor purchased a tractor for $170000 and anticipates using it for 9 years. The salvage value of the tractor at the end of the 9 years is estimated to be zero. Using the 2.2 declining-balance method of depreciation accounting, determine the book value of the tractor at the end of each of the 9 years. Answer the following questions Book value at the end of the first year Book value at the end of the second year Book value at the end of the third year Book value at the end of the fourth year Book value at the end of the fifth year Book value at the end of the sixth year Book value at the end of the seventh year