intercontinental, incorporated, uses a perpetual inventory system. consider the following information about its inventory: august 1, purchased 10 units for $910 or $91 per unit; august 3, purchased 15 units for $1,590 or $106 per unit; august 14, sold 20 units; august 17, purchased 20 units for $2,300 or $115 per unit; august 28, purchased 10 units for $1,190 or $119 per unit; august 30, sold 23 units.