A buyer uses a perpetual inventory system, and it purchased $4.000 of merchandise on credi terms of 210, n/30 on December 5 Later, on December 15 , the buyer pays the invoice in full Complete the buyer's journal entry for payment by selecting the account names from the drop-down menus and entering the dollar amounts in the debit or credit columns. Journal entry worksheet A buyer uses a perpetual inventory syatem, and it purchased $4,000 of merchandise on credit terms of 2/10,5/30 on December 5 , Later, on December 15, the buyer pays the irmoice in full