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Current Attempt in Progress Your answer is incorrect. Concord Company uses a periodic inventory system. For April, when the company sold 550 units, the following information is available. Compute the April 30 inventory and the April cost of goods sold using the FIFO method. Current Attempt in Progress Your answer is incorrect. Concord Company uses a periodic inventory system. For April, when the company sold 550 units, the following information is available. Compute the April 30 inventory and the April cost of goods sold using the FIFO method