Home Builders Inc. purchased a truck for $60,000 on January 1, 2018. It has an expected salvage value of $11,000 at the end of its seven-year useful life. How much is combined depreciation expense in 2018 and 2019 using straight-line depreciation? How much is depreciation expense in 2018 using double-declining balance depreciation? How much is depreciation expense in 2019 using double-declining balance depreciation? How much is depreciation expense in 2018 using sum-of-years digits depreciation? How much is depreciation expense in 2019 using sum-of-years digits depreciation?