I couldn't find the right answer for AR turnover

Analyzing Segment Disclosures Raytheon Company disclosed the following data related to segment sales and operating profiE for fiscal 2018. Total Net Sales Operating Income $ millions 2018 201? 2016 2018 201?I 2016 Integrated defense systems $6,130 $5,304 $5,529 $1,023 $935 $501 Intelligence; information and services 61722 6.1??? 6.159 538 455 46? Missile systems 3,298 2,?3? 1,096 923 1,010 921 Space and airborne systems 6;?48 5,430 6.182 334 862 303 Forcepoint 534 508 586 S 33 90 Eliminations {1,514} (1,45) [11361) Total net sales $2?J068 $25,333 $24,201 The company also reported the following on its balance sheet. Sr'nillions 2018 201? Receivables" $1,643 $1,324 1" (net of allowance for doubtful accounts of $1 2 and $8} Required 3. Which segment is largest in 2018? Missile Systems 3 V b. Calculate the operating profit margin for each segment and determine which segment is most protable in 2018 by this measure. Note: Round percentage to one decimal place (for example. enter 52% for 6,6555%). b. Calculate the operating profit margin for each segment and determine which segment is most protable in 2018 by this measure. Note: Round percentage to one decimal place (for example. enter 5.2% for 6.6555%J. Operating Profit Margin Integrated Defense Systems 16.6% v Intelligence, Information and Services 8% V Missile Systems 11.7% v Space and Airborne Systems 13.1% v Forcepoint 0.3% V Most protable segment: Integrated Defense Systems V c. Which segment's sales grew the most in 2018? How does this compare to 201? sales growth? Note: Round percentage to one decimal place (for example. enter 5.2% for 6655595). 2018 Growth '14: 201? Growth t-'u Segment with the most growth in 2018: Intelligence Information and Services v 8.3% V 0.1 '36 v 0'. Calculate the companfs accounts receivable turnover and its days sales ouEtanding (050} for 2018. Note: Round amount [your final answer) to one decimal place (for example. enter 6.8 for 6.22555). ARturnover 13.9 I DSO 20 V e. Assess the size of the receivables allowance. Note: Round percentage to one decimal place [for example. enter 6.2% for 5.6555911). 2018 2011'I Allowance as 9% of AR gross 0.? \"K1 v 0.6% V