(Major U.S. Retailers) The following table shows financial data (year 2004) for Costco Wholesale and WaI-Mart, two major U.S. retailers. Q2. 1 0 Inventories Sales (net) COGS Source: Compusta!, WRDS. Costco Wholesale ($ Millions) $ 3,643 $48, 1 06 $41 , 651 Wal-Mart Stores ($ Millions) $ 29,447 $286, 1 03 $21 5,493 Assume that both companies have an average annual holding cost rate of 30 percent (i.e., it costs both retailers $3 to hold an item that they procured for $ 1 0 for one entire year). a. How many days, on average, does a product stay in Costco's inventory before it is sold? Assume that stores are operated 365 days a year. b. How much lower is, on average, the inventory cost for Costco compared to Wal-Mart of a household cleaner valued at $5 COGS? Assume that the unit cost of the household cleaner is the same for both companies and that the price and the inventory turns of an item are independent.