Wal-Mart Stores, Inc., is the largest retailer in the United States. Recently, Wal-Mart reported these figures (in billions of dollars): 1999 1998 Net sales. Receivables at end of year $165 1 $138 1 The Wal-Mart financial statements include no uncollectible-account expense or allowance. Required 1. Compute Wal-Mart's average collection period on receivables during 1999. 2. Why are Wal-Mart's receivables so low? How can WalMart have $1 billion of receivables at January 31, 1999, and no significant allowance for uncollectibles?