Below is the net income of Tamarisk Instrument Co., a private corporation, computed under the three inventory methods using a periodic system. FIFO Average Cost LIFO 2018 $27,400 $24,200 $21,400 2019 28,300 23,500 19,800 2020 31,100 29,100 25,700 2021 33,500 29,200 25,000 (Ignore tax considerations.) (a) Assume that in 2021 Tamarisk decided to change from the FIFO method to the average-cost method of pricing inventories. Prepare the journal entry necessary for the change that took place during 2021, and show net income reported for 2018, 2019, 2020, and 2021. (Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry"for the account titles and enter for the amounts.) Account Titles and Explanation Debit Credit 2021 2020 2019 2018 $ $ $ (b) Assume that in 2021 Tamarisk, which had been using the LIFO method since incorporation in 2018, changed to the FIFO method of pricing inventories. Prepare the journal entry necessary to record the change in 2021 and show net income reported for 2018, 2019, 2020, and 2021. (Credit account titles are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter for the amounts.) Account Titles and Explanation Debit Credit 2021 2020 2019 Net income $ $ $ $