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

Instructions
(a) For 2015 and 2014, calculate CN's current ratio, receivables turnover, and average collection period.
(b) Comment on any improvement or deterioration in CN's management of its accounts receivable.

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2015 20142013 Accounts receivable, gross885 $ 937 $ 822 Allowance for doubtful accounts Accounts receivable, net Revenues Total current assets Total current liabilities 7 7 78 928 815 12,611 12,134 10,575 2,153 1993 1,977 2,998 2,201 2,498