Revision of Depreciation A building with a cost of $300,000 has an estimated residual value of $120,000, has an estimated useful life of 9 years, and is depreciated by the straight-line method. a. What is the amount of the annual depreciation? $1 20,000 b. What is the book value at the end of the fifth year of use? $ 200,000 C. If at the start of the sixth year it is estimated that the remaining life is 5 years and that the residual value is $85,000, what is the depreciation expense for each of the remaining 5 years? $