Nash's Trading Post, LLC just began business and made the following four inventory purchases in June: June 1 111 units $770 June 10 148 units 1150 June 15 148 units 1240 June 28 111 units 980 $4140 A physical count of merchandise inventory (rounded to whole dollar) on June 30 reveals that there are 160 units on hand. The inventory method which results in the highest gross profit for June is