MedEquip Inc. uses a periodic inventory system. The transactions for March are detailed below.

Date	Activities	Units Acquired at Cost	Units Sold at Retail
Mar. 1	Beginning inventory	150 units @ $60 per unit
Mar. 4	Purchase	500 units @ $65 per unit
Mar. 11	Sales		450 units @ $100 per unit
Mar. 18	Purchase	350 units @ $70 per unit
Mar. 25	Sales		300 units @ $110 per unit

For specific identification, the March 11 sale consisted of 50 units from beginning inventory and 400 units from the March 4 purchase; the March 25 sale consisted of 150 units from the March 18 purchase and 150 units from the March 4 purchase.

Required:

1. Calculate the ending inventory and COGS using FIFO and LIFO methods.
2. Determine the gross profit for March using the weighted average cost method.
3. Analyze the impact of the chosen inventory costing method on the financial statements and performance metrics.
4. Recommend an inventory costing method considering MedEquip Inc.'s long-term business strategy.