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 $70.00 $525,000 10 Purchase 22,500 80.00 1,800,000 28 Sale 11,250 140.00 1,575,000 30 Sale 3,750 140.00 525,000 Feb. 5 Sale 1,500 140.00 210,000 10 Purchase 54,000 82.50 4,455,000 16 Sale 27,000 150.00 4,050,000 28 Sale 25,500 150.00 3,825,000 Mar. 5 Purchase 45,000 84.50 3,802,500 14 Sale 30,000 150.00 4,500,000 25 Purchase 7,500 85.00 637,500 30 Sale 26,250 150.00 3,937,500