LO 2P6-74B. (Learning Objective 2: Compare various inventory costing methods) The records of Buzz Aviation include the following accounts for inventory of aviation parts at July 31 of the current year: Inventory Aug 1 Balance 600 units @ $5.50 S 3,300 Nov 5 Purchase 500 units @ $7.20 3,600 Jan 24 Purchase 7,000 units @ $7.50 52,500 Apr 8 Purchase 900 units $8.00 7,200 Sales Revenue Jul 31 8,090 units $114,878