1. An asset cost $400 when purchased. A scrap value of $50 was expected at the end of a 7-year service life. Determine the book value at the end of 4 year's use and the depreciation charge for the fifth year by: a) Straight-line depreciation b) Sum-of-the-years digit depreciation c) Double declining balance depreciation d) Sinking fund depreciation (i = 6%) e) MACRS assuming this is a 7-year class asset