this section provides a comprehensive illustration of inventory costing methods. we use information from trekking, a sporting goods store. among its many products ,trekking carries one type of mountain bike whose sales are directed at resorts that provide inexpensive mountain bikes for complimentary guest use. its customers usually purchase in amounts of 10 or more bikes. we use trekking's data from august. its mountain bike (unit) inventory at the beginning of august and its purchases and sales during august are shown in exhibit 6.3. it ends august with 12 bikes remaining in inventory.