Swifty uses the FIFO cost flow assumption. All purchases and sales are on account. (a) Assume Swifty uses a periodic system. Prepare all necessary journal entries, including the end-of-month closing entry to record cost of goods sold. A physical count indicates that the ending inventory for January is 113 units. (If no entry is required, select "No entry" for the account titles and enter O for the amounts. Credit account titles are automatically indented when amount is entered. Do not indent monually, List all debit entries before credit entries.)