(a) Prepare the journal entry necessary to record a change from the average cost method to the FIFO method in 2021 . (Credit account tittes are outomatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts.) (b) Determine net income to be reported for 2018,2019 , and 2020 , after giving effect to the change in accounting principle. (c) Assume Blue Company used the LIFO method instead of the average cost method during the years 2018-2020. In 202 Blue changed to the FIFO method. Prepare the journal entry necessary to record the change in principle. (Credit account ti are automatically indented when amount is entered. Do not indent manually. If no entry is required, select "No Entry" for the accou itles and enter O for the amounts.)