Swifty Corporation began operations on December 1,2024 . The only inventory transaction in 2024 was the purchase of inventory on December 10,2024 , at a cost of $21 per unit. None of this inventory was sold in 2024 . Relevant information is as follows. During the year, the following purchases and sales were made. The company uses the periodic inventory method. (a1) Calculate the weighted-average cost per unit. (Round answer to 2 decimal places, e.g. 2.76.) Weighted-average cost $