The beginning inventory of merchandise at Keats Office Supplies and data on purchases and sales for a three-month period are as follows: Date Transaction Number of Units Per Unit Total March 3 Inventory 78 $525 $40,950 8 Purchase 156 630 98,280 11 Sale 105 1,750 183,750 30 Sale 66 1,750 115,500 April 8 Purchase 130 700 91,000 10 Sale 78 1,750 136,500 19 Sale 39 1,750 68,250 28 Purchase 130 770 100,100 May 5 Sale 78 1,840 143,520 16 Sale 104 1,840 191,360 21 Purchase 234 840 196,560 28 Sale 117 1,840 215,280