4. Unden Sound Company just began business and made the following four inventory purchases in June June 1 150 units $ 780 June 10 200 units 1,170 June 15 200 units 1,260 June 28 150 units 990 $4,200 A physical count of merchandise inventory on June 30 reveals that there are 210 units on hand. The Inventory method which results in the highest gross profit for June is a the LIFO method (b) the FIFO method C. the average cost method. d. not determinable