A warehouse with a cost of $778,800 has an estimated residual value of $70,800, has an estimated useful life of 20 years, and is depreciated by the straight-line method.

a. Determine the amount of the annual depreciation. $

b. Determine the book value after 7 full years of use. $

c. Assuming that at the start of year 8 the remaining life is estimated to be 18 years and the residual value is estimated to be $57,600, determine the depreciation expense for each of the remaining 18 years. $