Q$2\mathrm{.}9($Major U$.$S$.$ Retailers$)$ The following table shows financial data $($year $2004)$ for Costco

Wholesale and Wal$-$Mart, two major U$.$S$.$ retailers.

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.