Greg's Bicycle Shop has the following transactions related to its top-selling Mongoose mountain bike for the month of March. Greg's Bicycle Shop uses a periodic inventory system. Transactions. Beginning inventory Total Cost Date March 1 Units 20 Unit Cost $175 $3,500 March 5 March 9 Sale ($250 each) Purchase 15 10 195 1,950 March 17 March 22 Sale ($300 each) Purchase 8 10 205 2,050 March 27 March 30 Sale ($325 each). Purchase. 12 8 225 1,800 $9,300 For the specific identification method, the March 5 sale consists of bikes from beginning inventory, the March 17 sale consists of bikes from the March 9 purchase, and the March 27 sale consists of four bikes from beginning inventory and eight bikes from the March 22 purchase.