June 1 June 7 June 22 Beginning inventory Purchases Purchases 20 units at $19 70 units at $20 10 units at $23 $ 380 1,400 230 $2,010 A physical count of merchandise inventory on June 30 reveals that there are 30 units on hand. Using the average cost method, the weighted average COST PER UNIT (rounded to the nearest penny) is: Select one: a. $23.00 b. $19.00 c. $20.10 d. $20.67 e. None of the above