Trey Monson starts a merchandising business on December 1 and enters into the following three inventory purchases. Monson uses a perpetual inventory system. Also, on December 15, Monson sells 18 units for $10 each. Purchases on December 7 Purchases on December 14 8 units $4.00 cost 26 units $6.00 cost Purchases on December 21 18 units $7.00 cost- Goods purchased Perpetual LIFO: Cost of Goods Sold Inventory Balance Date # of units Cost per unit Cost of Goods Available for Sale # of units unit Cost per Cost of Goods Sold # of units Cost per Inventory unit Balance sold December 7 December 14 Total December 14 December 15 Total December 15 December 21 Totals