Given the following data, calculate cost of goods sold and the cost of ending inventory.
3 separate methods, FIFO, LIFO and Weighted Average. You must show ALL calculations.
Date		Transaction
1/10		Bought 200 inventory units @ $15
1/20		Bought 200 inventory units @ $17
1/25		Sold 150 inventory units @ $30
1/28		Bought 100 inventory units @ $20
1/31		Sold 130 inventory units @ $30
2/4		Bought 90 inventory units @ $22