Waterway Company purchased machinery on January 1,2020 , for $95,200. The machinery is estimated to have a salvage value of $9,520 after a useful life of 8 years. (a) Compute 2020 depreciation expense using the double-declining-balance method. Waterway Company purchased machinery on January 1,2020 , for $95,200. The machinery is estimated to have a salvage value of $9,520 after a useful life of 8 years. (a) Compute 2020 depreciation expense using the double-declining-balance method