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Required: Compute the January 31 ending inventory and cost of goods sold for January, assuming Denver uses average cost and a periodic inventory system. (Do not round intermediate calculations. Round your final answers to nearest whole dollar amount. Please write down your calculation process. Simply showing solution numbers without supporting solving process will receive ZERO point.) Required: Compute the January 31 ending inventory and cost of goods sold for January, assuming Denver uses average cost and a periodic inventory system. (Do not round intermediate calculations. Round your final answers to nearest whole dollar amount. Please write down your calculation process. Simply showing solution numbers without supporting solving process will receive ZERO point.)