Sorter Company purchased equipment for $170,000 on January 2, 2019. The equipment has an estimated service life of 8 years and an estimated residual value of $17,000 . Required: Compute the depreciation expense for 2019 under each of the following methods: Straight-line: $ fill in the blank 1 Sum-of-the-years'-digits: $ fill in the blank 2 Double-declining-balance: $ fill in the blank 3 Depreciation causes the book value of the assets to each period. When an accelerated depreciation method is used, the rate of return each period