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 - 220 units at $18 March 5 - Purchase 180 units for $20 April 6 - Sell 300 units for $38 June 30 - Purchase 250 units for $22 August 16 - Sell 170 units for $40