Nov. 5 Purchased 600 units of product at a cost of $10 per unit. Terms of the sale are 2/10,n/60; the invoice is dated November 5 . Nov. 7 Returned 25 defective units from the November 5 purchase and received full credit. Nov. 15 Paid the amount due from the November 5 purchase, less the return on November 7. Prepare journal entries to record each of the merchandising transactions assuming that the periodic inventory system is used