Best Buy posted mixed results on Tuesday as the retailer's holiday-quarter sales declined and missed Wall Street's expectations, but its earnings topped estimates as it showed improved profitability. For the current fiscal year, the consumer electronics retailer expects revenue to range between $41.2 billion and $42.1 billion, compared with $41.69 billion in the most recent fiscal year. It expects adjusted earnings per share to range from $6.30 to $6.60, after it reported adjusted earnings per