A delivery truck was acquired on January 1, 2020 at a cost of $40,000. The truck was originally estimated to have a salvage value of $15,000 and an estimated life of 5 years. Depreciation has been recorded through December 31, 2021 using the straight-line method. On January 1, 2022, the trucks engine was rebuilt at a cost of $3,000 the estimated salvage value was revised to $13,000 and the useful life was revised to a total of 6 years.