Can someone explain number 12 to me. Its the only one im stuck on

-F:5-24 Journalizing purchase and sales transactions Journalize the following transactions for Soul Art Gift Shop. Explanations are not required. Feb. 3 Purchased $3,300 of merchandise inventory on account under terms 3/10, n/EOM and FOB shipping point from Still Waters Herbs. 7 Returned $900 of defective merchandise purchased on February 3. 9 Paid freight bill of $400 on February 3 purchase. 10 Sold merchandise inventory on account for $4,700 to Trybe Yoga Studio. Payment terms were 2/15,n/30. These goods cost the company $2,350. 12 Paid amount owed on credit purchase of February 3 , less the return and the discount. 28 Received cash from Trybe Yoga Studio in full settlement of their debt