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 - 90 units at $11 March 3 - Purchase 300 units for $15 April 4 - Sell 240 units for $28 June 30 - Purchase 250 units for $18 August 16 - Sell 180 units for $30