Based on the following information, calculate the cost of goods sold and ending inventory using FIFO, LIFO, and weighted average assuming a perpetual inventory system is in place. Beginning Balance - 100 units at $9 March 5 - Purchase 250 units for $17 April 6 - Sell 200 units for $38 June 30 - Purchase 300 units for $21 August 16-Sell 180 units for $40