Weighted Average Cost Method with Perpetual Inventory The beginning inventory for Midnight Supplies and data on purchases and sales for a three-month period are as follows: Number Date Transaction of Units Per Unit Total Jan. 1 Inventory 7.500 $75.00 $562,500 22.500 85.00 1,912.500 11,250 150.00 1,687,500 562,500 225,000 54,000 87.50 4,725,000 27,000 160.00 4,320,000 25,500 160.00 4,080,000 4,027,500 30.000 160.00 4,800,000 675,000 4,200,000 10 Purchase 28 Sale 30 Sale 3,750 150.00 Feb. 5 Sale 1,500 150.00 10 Purchase 16 Sale 28 Sale Mar. 5 Purchase 45,000 89.50 14 Sale 25 Purchase 30 Sale 7,500 90.00 26,250 160.00