Shamrock Company purchased a delivery truck for $49,000 on January 1, 2020. The truck was assigned an estimated useful life of 5 years and has a residual value of $10,900. Compute depreciation expense using the double-declining-balance method for the years 2020 and 2021. Depreciation expense for 2020 Depreciation expense for 2021 Shamrock Company purchased a delivery truck for $49,000 on January 1, 2020. The truck was assigned an estimated useful life of 5 years and has a residual value of $10,900. Compute depreciation expense using the double-declining-balance method for the years 2020 and 2021. Depreciation expense for 2020 Depreciation expense for 2021