A company had the following related to inventory during its first year of business: (Click the icon to view the sales and purchases.) The company uses a periodic inventory system. Complete the following in the determination of gross profit for each of the inventory costing methods. Using FIFO inventory costing: Gross profit (1) Using LIFO inventory costing: Gross profit (1) Using weighted average inventory costing: (For calculations round cost per unit to the nearest cent. Round all other amounts to the nearest dollar.) Gross profit January 5 February 15 April 10 June 30 August 15 November 28 Purchased 55 units at $80 each Sold 40 units at $140 each Sold 5 units at $140 each Purchased 55 units at $85 each Sold 30 units at $140 each Purchased 35 units at $115 each