Z-Mart had the following transactions for October: October 6: Purchased 650 units of inventory at $5 per unit. The seller offered a cash discount of 2/10, n/30. October 8: Returned 25 defective units and received full credit. October 10: Paid the amount in full, less the returned items. Instructions: Prepare journal entries to record each of the preceding transactions. Assume a perpetual inventory system