fedex corporation reported the following rounded amounts (in millions): 2019 2018 accounts receivable $9,415 $8,880 allowance for doubtful accounts (300) (400) accounts receivable, net of allowance $9,115 $8,480 net sales (assume all on credit) $69,690 $65,450 required: determine the receivables turnover ratio and days to collect for 2019. do the measures calculated in requirement 1 represent an improvement (or deterioration) in receivables turnover, compared to 2018, when the turnover was 8.1?