How do I journalize each of these transactions?

May 1. Paid rent for May, $5,000. 3. Purchased merchandise on account from Martin Co., terms 2/10, n/30, FOB shipping point, $36,000. 4. Paid freight on purchase of May 3, $600. 6. Sold merchandise on account to Korman Co., terms 2/10, n/30, FOB shipping point, $68, 500. The cost of the merchandise sold was $41,000. 7. Received $22, 300 cash from Halstad Co. on account. 10. Sold merchandise for cash, $54,000. The cost of the merchandise sold was $32,000. 13. Paid for merchandise purchased on May 3. 15. Paid advertising expense for last half of May, $11,000. 16. Received cash from sale of May 6. 19. Purchased merchandise for cash, $18, 700. 19. Paid $33, 450 to Buttons Co. on account. 20. Paid Korman Co. a cash refund of $13, 230 for returned merchandise from sale of May 6. The invoice amount of the returned merchandise was $13, 500 and the cost of the returned merchandise was $8,000. Record the following transactions on Page 21 of the journal: 20. Sold merchandise on account to Crescent Co., terms 1/10, n/30, FOB shipping point, $110,000. The cost of the merchandise sold was $70,000