Required information [The following information applies to the questions displayed below.] During the year, Trombley Incorporated has the following inventory transactions. Date Transaction Number of Units Unit Cost Total Cost Jan. 1 Beginning inventory 10 $ 12 $120 Mar. 4 Purchase 15 11 165 Jun. 9 Purchase 20 10 200 Nov.11 Purchase 20 8 160 65 $645 For the entire year, the company sells 50 units of inventory for $20 each.