Calculator Print Item The primary difference between the periodic and perpetual inventory systems is that a a. periodic system keeps a record showing the inventory on hand at all times b. periodic system records the cost of the sale on the date the sale is made c. periodic system determines the inventory on hand only at the end of the accounting period d. periodic system provides an casy means to determine inventory shrinkage PM Calculator Print Item The method of estimating inventory that uses records of the selling prices of the merchandise is called a. average cost method b. retail method c. gross profit method d. inventory tumover method