Lien Company engaged in the following transactions:

July 2 Purchased merchandise on credit from Jonak Company, terms 2/10, n/30, FOB destination, invoice dated July, 1, $4,000.

6 Returned some merchandise to Jonak Company for full credit, $500.

11 Paid Jonak Company for purchase of July 2 less return and discount.

14 Purchased merchandise on credit from Jonak Company, terms 2/10, n/30, FOB destination, invoice dated July 12, $4,500.

31 Paid amount owed Jonak Company for purchased of July 14.

Prepare journal entries and, assuming the perpetual inventory system, determine the total amount paid to Jonak Company.