Sandhill Co. had a beginning inventory balance on July 1 of 410 units at a cost of $3.00 each. During the month, the following inventory transactions took place: Purchases Sales Cost per Price per Date Units unit Date Units unit July 10 1,280 $3.10 July 2 300 $6.10 13 680 3.50 11 1,030 6.10 27 560 3.90 28 360 6.60