ABC Company reported net incomes for a three-year period as follows: 2018, $180,000; 2019, $190,000; 2020, $200,000. In reviewing the accounts in 2021 after the books for the prior year have been closed, you find that the following errors have been made: 2018 2019 2020 Understatement of ending inventory Understatement of depreciation expense Required: $40,000 $50,000 $30,000 $10,000 a. Determine corrected net incomes for 2018, 2019, and 2020. To earn partial credit, you need to show your calculations for each year. b. Prepare the journal entry to bring the books of the company up to date in 2021, assuming that the books have been closed for 2020.