Prepare journal entries to record each of the following transactions of a merchandising company. The company uses a perpetual inventory system and the gross method.

November $5$ Purchased $600$ units of product at a cost of $$10$ per unit. Terms of the sale are $\frac{2}{10},\frac{n}{60}$; the invoice is dated November $5.$

November $7$ Returned $25$ defective units from the November $5$ purchase and received full credit."

November $15$ Paid the amount due from the November $5$ purchase, minus the return on November $7.$