Crane Corporation began operations on December 1, 2019. The only inventory transaction in 2019 was the purchase of inventory on December 10, 2019, at a cost of $ 21 per unit. None of this inventory was sold in 2019. Relevant information is as follows. 110 Ending inventory units December 31, 2019 December 31, 2020, by purchase date December 2, 2020 July 20, 2020 110 50 160 During the year 2020, the following purchases and sales were made. Purchases 310 units at $25 310 units at 26 Sales April 10 August 20 November 18 December 12 March 15 July 20 September 4 December 2 210 310 29 160 210 units at 110 units at 32 210 The company uses the periodic inventory method. (a1) Your answer is incorrect. Calculate average-cost per unit. (Round answer to 2 decimal places, e.e. 2.76.) Average-cost $