USE THE FOLLOWING INFORMATION FOR QUESTIONS #4 - #6: OBX Corp has the following information. All purchases & sales were made on account: Assume OBX Corp uses the FIFO method of inventory and Periodic Inventory System. Units Units Date Amount Per Unit Purchased Sold Beginning Inventory 1,800 $11.50 12/17/X9 2,000 $14.25 12/22/X9 1,200 $24.30 12/26/X9 3,000 $12.75 12/30/X9 2,000 $23.50 Totals 6,800 3,200