Weighted Average Cost Method with Perpetual Inventory The beginning inventory for Dunne Co. and data on purchases and sales for a three-month period are as follows: Number Date Transaction of Units Per Unit Total 25 75 40 30 60 50 20 80 40 25 35 Apr. 3 Inventory $1,200 $30,000 93,000 80,000 60,000 75,600 100,000 40,000 1,260 100,800 90,000 56,250 44,240 99,000 1,240 2,000 2,000 1,260 2,000 2,000 8 Purchase 11 Sale 30 Sale May 8 Purchase 10 Sale 19 Sale 28 Purchase June 5 Sale 16 Sale 21 Purchase 28 Sale 2,250 2,250 1,264 2,250