Becker office service purchased a new computer system on january 1, 2018, for $33,000. it is expected to have a five-year useful life and a $3,500 salvage value. becker office service expects to use the computer system more extensively in the early years of its life. assume that becker office service sold the computer system at the end of the fourth year for $21,000. compute the amount of gain or loss using each depreciation method. (negative amounts should be indicated with a minus sign. do not round intermediate calculations. round the final answers to nearest dollar amount.)