Packaging Corporation of America produces containerboard and white papers. KapStone Paper and Packaging Corporation manufactures unbleached kraft paper products and corrugated products. Financial statement data for these two companies follow: Packaging Corporation of America ($ in millions of dollars) 2011 2012 2013 2014
Sales $2,843.9 $3,665.3 $5,852.6
Accounts receivable at December 31 $320.0 352.1 643.1 646.1

KapStone Paper and Packaging Corporation ($ in millions of dollars) 2011 2012 2013 2014
Sales $1,216.6 $1,748.2 $2,300.9
Accounts receivable at December 31 $108.3 111.6 232.3 228.7

Required:
a. Determine the receivables turnover ratios for both companies for 2012, 2013, end 2014.
b. Which company collected its accounts receivable more quickly in 20147
c. Which company showed more improvement in accounts receivable collection over the period presented?