E8.17 (LO 1) AN The following information (in millions) was taken from the December 31 financial statements of Canadian National Railway Company: 2017 Accounts receivable, 1,241 2019 2018 S S 1,195 1,000 gross Allowance for 28 16 doubtful accounts Accounts 984 receivable, 1,213 1,169 net Revenues 14,917 14,321 13,041 Total 2,830 2,728 2,190 current assets. Total 4,287 3,500 3.983 current liabilities $ Instructions a. Calculate the 2019 and 2018 current ratios. b. Calculate the receivables turnover and collection period for 2019 and 2018. c. Comment on any improvement or weakening in CN's liquidity and its management of accounts receivable