Donna's Beauty Salon had the following transactions for July: July 9: Purchased 625 units of inventory at $6 per unit. The seller offered a cash discount of 2/10, n/30. July 10: Returned 30 defective units and received full credit. July 18: 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.