Meca Concrete purchased a mixer on January 1, 2019, at a cost of $366,000. Meca used sum of the year digit method for depreciation for 2019 and 2020 . It was based on an estimated eight-year life and $6,000 estimated residual value. In 2021, Meca switched the depreciation method to double declining balance method and revised its estimates and now believes the mixer will have a total service life of only seven years, and that the residual value will be only $2,000. Required: 1. Compute depreciation for 2021 and 2022. 2. Meca sold the mixer on January 1st 2023 for 20,000. Prepare journal entry to record the sales entry.