The following table shows financial data (year 2004) for Costco Wholesale and Walmart, two major U.S. retailers.

Question:

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 $10 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 Walmart 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.