Revision of Deration A building with a cost of 1945.000 has an estimated real value of $189,000, has an estimated settle of 36 years, and is deprecated by the straight-bon method what is the amount of the annual depreciation? Do not round intermediate calculations . What is the book valust the end of the twentieth year of use? c. It the start of the twenty-first year it is estimated that the remaining the 20 years and that the residual value is $4,000, what is the depreciation expense for each of the remaining 20 years