Listed below are the net sales for Blair Corporation, a mail-order retailer located in Warren, Pennsylvania, for the years 1997 to 2006 . In 2007 , Blair became a subsidiary of Appleseeds Topco. Its website is www.blair.com. Use the mean sales for the earliest three years to determine a base and then find the index for 2003 and 2006 . By how much have net sales incredsed from the base period? (d). | Numerade