Quigley uses a periodic inventory system. At the end of June, Quigley had 300 units on hand. Total sales were $20,000. June 1 On hand, 200 units at $ 12 each $ 2,400 5 Purchased 300 units at $ 13 each 3,900 12 Purchased 400 units at $ 14 each 5,600 20 Purchased 250 units at $ 15 each 3,750 24 Purchased 150 units at $ 17 each 2,550 Merchandise available for sale (1300 units) $18,200 11. If Quigley uses