An asset is being depreciated over a 10-year period. It has no salvage value at the end of 10 years, i.e. S=0. If the depreciation charge in the third year is $1000, find the depreciation charge in the ninth year using excel( provide excel spreadsheet in answer) : 1) By the sinking fund method, assuming j=0.05. 2) By the straight line method. 3) By the sum of the years digit method. Why can the declining balance method not be used?