Periodic Inventory by Three Methods The beginning inventory at Midnight Supplies and data on purchases and sales for a three-month period ending March 31, are as follows: Date Transaction Number of Units Per Unit Total Jan. 1 Inventory 7,500 $75.00 $562,500 10 Purchase 22,500 85.00 1,912,500 28 Sale 11,250 150.00 1,687,500 30 Sale 3,750 150.00 562,500 Feb. 5 Sale 1,500 150.00 225,000 10 Purchase 54,000 87.50 4,725,000 16 Sale 27,000 160.00 4,320,000