Jammer Company uses a weighted average perpetual inventory system and reports the following: August 2 August 18 August 29 August 31 Purchase Purchase Sale Purchase 21 units at $17.00 per unit. 23 units at $17.00 per unit. 42 units. 26 units at $20.00 per unit. What is the per-unit value of ending inventory on August 31? (Round your per unit answers to 2 decimal places.) Multiple Choice $17.00 $17.00 O $19.79 $21.14 O $20.00