Super Duper Company sells top-of-the-line skateboards. Super Duper is concerned about maintaining high earnings and has chosen to use the periodic FIFO method of inventory costing. At the beginning of the year, Super Duper had 5,000 skateboards in inventory, each costing $20. In April, Super Duper purchased 2,000 skateboards at a cost of $22 and in August, purchased 4,000 more at a cost of $23. During the year, Super Duper sold 9,000 skateboards for $40 each.