Montoure Company uses a perpetual inventory system. It entered into the following calendar-year purchases and sales transactions. Date January 1 February 10 March 13 March 15 August 21 September 5 Activities Beginning inventory Purchase Purchase Sales Purchase Purchase September 10. Sales Totals Units Sold at Retail Units Acquired at Cost 600 units $40 per unit 360 units $37 per unit 150 units $25 per unit 765 units @ $80 per unit 200 units 580 units $45 per unit @ $42 per unit 1,890 units 780 units $80 per unit 1,545 units