You have the following information for Vaughn Inc. for the month ended June 30, 2022. Vaughn uses a periodic inventory system. Unit Cost or Date Description Quantity Selling Price June 1 Beginning inventory 40 $28 June 4 Purchase 135 31 June 10 Sale 110 58 June 11 Sale return 15 58 June 18 Purchase 55 34 June 18 Purchase return 10 34 June 25 Sale 65 64 June 28 Purchase 35 38 (a1) Your answer is incorrect. Calculate cost per unit. (Round answer to 2 decimal places, eg. 5.25) Weighted-average cost per unit (a2) The parts of this question must be completed in order. This part will be available when you complete the part above. (a3) The parts of this question must be completed in order. This part will be available when you complete the part above. (b) The parts of this question must be completed in order. This part will be available when you complete the part above