The accounting records of Shumway Ag Implement show the following data.
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Beginning inventory
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4,000 units at $ 3
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Purchases
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6,000 units at $ 4
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Sales
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7,000 units at $12
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Determine the cost of goods sold during the period under a periodic inventory system using (a) the FIFO method, (b) the LIFO method, and (c) the average-cost method.