The following information (in millions) was taken from the December 31 financial statements of Canadian National Railway Company (CN):

Instructions
(a) For 2010 and 2009, calculate CN's current ratio, receivables turnover, and average collection period.
(b) Comment on any improvement or deterioration in CN's liquidity and management of its accounts receivable.

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Accounts receivable, gross Allowance for doubtful accounts Accounts receivable, net Revenues Total current assets Total current liabilities 2010 $796 21 775 8,297 1,590 1,906 2009 $ 831 34 797 7,367 1,490 1,237 2008 $939 26 913 8,482 1,149 1,958