The begining inventory at Keats Office Supplies and data on purchases three-month period are as follows FIFO perpetual inventory ta on purchases and sales for a PR 7-1A Per Unit Number of Units 300 500 400 250 80 450 250 150 175 160 150 140 Tota! Date Transaction Date Mar. 1 Inventory $20 6,000 21 10,500 35 14,000 40 10,000 40 3,200 22 9,900 42 10,500 45 6,750 24 4,200 50 8,000 25 50 7,000 10 Purchase 28 Sale 30 Sale Apr. 5 Sale 10 Purchase 16 Sale 28 Sale May 5 Purchase 14 Sale 25 Purchase 30 Sale 3,750