Montoure Company uses a perpetual inventory system. It entered into the following calendar-year purchases and sales transactions. Date January 1 Activities Beginning inventory February 10 Purchase March 13 March 15 August 21 September 5 Purchase Sales Purchase Purchase September 10 Sales Totals Units Acquired at Cost 660 units @ $35 per unit 330 units @ $32 per unit 110 units @ $20 per unit 180 units $40 per unit 570 units @ $36 per unit 1,850 units Units Sold at Retail 760 units @$75 per unit 750 units @ $75 per unit 1,510 units