please give me the answer for all 3 questions together. Thank you for your time and help.

Question #4 (2) Lost Lagoon Limited has the following inventory data: July 1 Beginning inventory 50 units at $120 5 Purchases 300 units at $112 14 Sale 200 units Purchases 150 units at $115 30 Sale 140 units 21 Required: Assuming that a periodic inventory system is used, calculate the cost of goods sold on a FIFO basis. Question #5 (2) BC Co. has accounts receivable totaling $850,000 and an Allowance for doubtful Accounts balance of $60,000. The company will have to write off an uncollectable receivable in the amount of $5,000. Required: What will be the effect on bad debt expense of writing off this accounts receivable? Explain. Question #6 (2) The following information was available for Canada Company at ending inventory $120,000, Cost of goods sold $636,000; and sales $900,000. Required: Calculate Canada Company's days in inventory for 2022