At the beginning of October, Bowser Company's inventory consists of 63 units with a cost per unit of $37. The following transactions occur during the month of October. October 4 Purchase 117 units of inventory on account from Waluigi Company for $50 per unit, terms 2/10, n/30. October 5 Pay cash for freight charges related to the October 4 purchase, $485. October 9 Return 20 defective units from the October 4 purchase and receipt of credit. October 12 Pay Waluigi Company in full. October 15 Sell 147 units of inventory to customers on account, $11,760. (Hint: The cost of units sold from the October 4 purchase includes $50 unit cost plus $5 per unit for freight less $1 per unit for the purchase discount, or $54 per unit.) October 19 Receive full payment from customers related to the sale on October 15. October 20 Purchase 87 units of inventory from Waluigi Company for $57 per unit. October 22Sell87 units of inventory to customers for cash, $6,960. Required: 1. Assuming that Bowser Company uses a FIFO perpetual inventory system to maintain its inventory records, record the transactions. 2. Suppose by the end of October that the remaining inventory is estimated to have a net realizable value per unit of $31. Record any necessary adjusting entry for lower of cost and net realizable value. 3. Prepare the top section of the multiple-step income statement through gross profit for the month of October after the adjusting entry for lower of cost and net realizable value