Pina Colada Corp. uses a periodic inventory system. Its records show the following for the month of May, in which 79 units were sold. Date Units Unit Cost Total Cost 30 $9 $270 May 1 15 Explanation Inventory Purchase Purchase 25 10 250 24 45 11 495 Total 100 $1,015 (a) Calculate the weighted average unit cost. (Round answer to 3 decimal places, e.g. 5.125.) Weighted-average unit cost ta