Mario's Home Systems has sales of $2,800, cost of goods sold of $2,100, inventory of $600, and accounts receivable of $600. How many days, on average, does it take Mario's to sell its inventory? Is Mario more or less efficient than its competitors if the competitors sell in 78 days? 4

2.1 days, more efficient 78.21 days, more efficient 78.21 days, less efficient 104.29 days, more efficient 104.29 days, less efficient