Prepare journal entries to record each of the following purchases transactions of a merchandising company. Show supporting calculations and assume a perpetual inventory system.

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.