Below is the net income of Pina Instrument Co., a private corporation, computed under the three inventory methods using a periodic system. FIFO Average Cost LIFO 2018 $24.700 $21,800 $19,300 2019 30,100 24.800 21.400 2020 26,400 24,400 21,000 2021 36,100 32,500 27,300 (Ignore tax considerations.) (a) Assume that in 2021 Pina 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 Net income $ $ $ $ (b) Assume that in 2021 Pina, 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 O for the amounts.) (b) Assume that in 2021 Pina, 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 O for the amounts.) Account Titles and Explanation Debit Credit 2021 2020 2019 2018 Net income $ $ $ $